fix(npm): better node version and version requirement compatibility (#15714)

13 files changed, 1785 insertions, 241 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 3d82df7c7..89a457236 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -829,6 +829,7 @@ dependencies = [
  "libc",
  "log 0.4.17",
  "mitata",
+ "monch",
  "nix",
  "node_resolver",
  "notify",
@@ -1211,12 +1212,13 @@ dependencies = [
 
 [[package]]
 name = "deno_task_shell"
-version = "0.5.0"
+version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c8348a58271a9672a735850dd2293770c83344759f8d18e4636e53de9e4605d2"
+checksum = "91059ae4dccefd55b84e0582683fe41e78b4287a2fe283962ea0a1698ea43d4d"
 dependencies = [
  "anyhow",
  "futures",
+ "monch",
  "os_pipe",
  "path-dedot",
  "tokio",
@@ -2725,6 +2727,12 @@ dependencies = [
 ]
 
 [[package]]
+name = "monch"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "350537f27a69018269e534582e2f1ec532ea7078b06485fdd4db0509bd70feb8"
+
+[[package]]
 name = "naga"
 version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
diff --git a/cli/Cargo.toml b/cli/Cargo.toml
index 13cbbfad3..3e6566798 100644
--- a/cli/Cargo.toml
+++ b/cli/Cargo.toml
@@ -53,7 +53,7 @@ deno_emit = "0.8.0"
 deno_graph = "0.33.0"
 deno_lint = { version = "0.32.0", features = ["docs"] }
 deno_runtime = { version = "0.74.0", path = "../runtime" }
-deno_task_shell = "0.5.0"
+deno_task_shell = "0.5.2"
 
 atty = "=0.2.14"
 base64 = "=0.13.0"
@@ -78,7 +78,8 @@ indexmap = "1.8.1"
 jsonc-parser = { version = "=0.21.0", features = ["serde"] }
 libc = "=0.2.126"
 log = { version = "=0.4.17", features = ["serde"] }
-mitata = '=0.0.7'
+mitata = "=0.0.7"
+monch = "=0.2.0"
 node_resolver = "=0.1.1"
 notify = "=5.0.0-pre.15"
 once_cell = "=1.12.0"
diff --git a/cli/npm/cache.rs b/cli/npm/cache.rs
index f3436f7c0..4ab39f6bd 100644
--- a/cli/npm/cache.rs
+++ b/cli/npm/cache.rs
@@ -17,6 +17,7 @@ use crate::deno_dir::DenoDir;
 use crate::file_fetcher::CacheSetting;
 use crate::fs_util;
 
+use super::semver::NpmVersion;
 use super::tarball::verify_and_extract_tarball;
 use super::NpmPackageId;
 use super::NpmPackageVersionDistInfo;
@@ -147,7 +148,7 @@ impl ReadonlyNpmCache {
 
     Some(NpmPackageId {
       name,
-      version: semver::Version::parse(version).unwrap(),
+      version: NpmVersion::parse(version).unwrap(),
     })
   }
 }
@@ -281,6 +282,7 @@ mod test {
   use deno_core::url::Url;
 
   use super::ReadonlyNpmCache;
+  use crate::npm::semver::NpmVersion;
   use crate::npm::NpmPackageId;
 
   #[test]
@@ -294,7 +296,7 @@ mod test {
       cache.package_folder(
         &NpmPackageId {
           name: "json".to_string(),
-          version: semver::Version::parse("1.2.5").unwrap(),
+          version: NpmVersion::parse("1.2.5").unwrap(),
         },
         &registry_url,
       ),
@@ -317,7 +319,7 @@ mod test {
       cache.package_folder(
         &NpmPackageId {
           name: "JSON".to_string(),
-          version: semver::Version::parse("1.2.5").unwrap(),
+          version: NpmVersion::parse("1.2.5").unwrap(),
         },
         &registry_url,
       ),
@@ -331,7 +333,7 @@ mod test {
       cache.package_folder(
         &NpmPackageId {
           name: "@types/JSON".to_string(),
-          version: semver::Version::parse("1.2.5").unwrap(),
+          version: NpmVersion::parse("1.2.5").unwrap(),
         },
         &registry_url,
       ),
diff --git a/cli/npm/mod.rs b/cli/npm/mod.rs
index bdbc5aca3..7bb515e9e 100644
--- a/cli/npm/mod.rs
+++ b/cli/npm/mod.rs
@@ -3,8 +3,8 @@
 mod cache;
 mod registry;
 mod resolution;
+mod semver;
 mod tarball;
-mod version_req;
 
 use std::io::ErrorKind;
 use std::path::Path;
diff --git a/cli/npm/registry.rs b/cli/npm/registry.rs
index ab7d81b75..c70741b01 100644
--- a/cli/npm/registry.rs
+++ b/cli/npm/registry.rs
@@ -23,7 +23,7 @@ use crate::fs_util;
 use crate::http_cache::CACHE_PERM;
 
 use super::cache::NpmCache;
-use super::version_req::NpmVersionReq;
+use super::semver::NpmVersionReq;
 
 // npm registry docs: https://github.com/npm/registry/blob/master/docs/REGISTRY-API.md
 
diff --git a/cli/npm/resolution.rs b/cli/npm/resolution.rs
index e102e2fa8..b6d643bb1 100644
--- a/cli/npm/resolution.rs
+++ b/cli/npm/resolution.rs
@@ -15,12 +15,13 @@ use super::registry::NpmPackageInfo;
 use super::registry::NpmPackageVersionDistInfo;
 use super::registry::NpmPackageVersionInfo;
 use super::registry::NpmRegistryApi;
-use super::version_req::SpecifierVersionReq;
+use super::semver::NpmVersion;
+use super::semver::SpecifierVersionReq;
 
 /// The version matcher used for npm schemed urls is more strict than
 /// the one used by npm packages.
 pub trait NpmVersionMatcher {
-  fn matches(&self, version: &semver::Version) -> bool;
+  fn matches(&self, version: &NpmVersion) -> bool;
   fn version_text(&self) -> String;
 }
 
@@ -104,7 +105,7 @@ impl std::fmt::Display for NpmPackageReq {
 }
 
 impl NpmVersionMatcher for NpmPackageReq {
-  fn matches(&self, version: &semver::Version) -> bool {
+  fn matches(&self, version: &NpmVersion) -> bool {
     match &self.version_req {
       Some(req) => req.matches(version),
       None => version.pre.is_empty(),
@@ -123,7 +124,7 @@ impl NpmVersionMatcher for NpmPackageReq {
 #[derive(Debug, Clone, PartialOrd, Ord, PartialEq, Eq, Hash)]
 pub struct NpmPackageId {
   pub name: String,
-  pub version: semver::Version,
+  pub version: NpmVersion,
 }
 
 impl NpmPackageId {
@@ -154,8 +155,8 @@ pub struct NpmResolutionPackage {
 
 #[derive(Debug, Clone, Default)]
 pub struct NpmResolutionSnapshot {
-  package_reqs: HashMap<NpmPackageReq, semver::Version>,
-  packages_by_name: HashMap<String, Vec<semver::Version>>,
+  package_reqs: HashMap<NpmPackageReq, NpmVersion>,
+  packages_by_name: HashMap<String, Vec<NpmVersion>>,
   packages: HashMap<NpmPackageId, NpmResolutionPackage>,
 }
 
@@ -230,8 +231,8 @@ impl NpmResolutionSnapshot {
     &self,
     name: &str,
     version_matcher: &impl NpmVersionMatcher,
-  ) -> Option<semver::Version> {
-    let mut maybe_best_version: Option<&semver::Version> = None;
+  ) -> Option<NpmVersion> {
+    let mut maybe_best_version: Option<&NpmVersion> = None;
     if let Some(versions) = self.packages_by_name.get(name) {
       for version in versions {
         if version_matcher.matches(version) {
@@ -472,7 +473,7 @@ impl NpmResolution {
 
 #[derive(Clone)]
 struct VersionAndInfo {
-  version: semver::Version,
+  version: NpmVersion,
   info: NpmPackageVersionInfo,
 }
 
@@ -484,7 +485,7 @@ fn get_resolved_package_version_and_info(
 ) -> Result<VersionAndInfo, AnyError> {
   let mut maybe_best_version: Option<VersionAndInfo> = None;
   for (_, version_info) in info.versions.into_iter() {
-    let version = semver::Version::parse(&version_info.version)?;
+    let version = NpmVersion::parse(&version_info.version)?;
     if version_matcher.matches(&version) {
       let is_best_version = maybe_best_version
         .as_ref()
diff --git a/cli/npm/semver/errors.rs b/cli/npm/semver/errors.rs
new file mode 100644
index 000000000..530d73c55
--- /dev/null
+++ b/cli/npm/semver/errors.rs
@@ -0,0 +1,38 @@
+// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
+
+use deno_core::anyhow::bail;
+use deno_core::error::AnyError;
+use monch::ParseError;
+use monch::ParseErrorFailure;
+use monch::ParseResult;
+
+pub fn with_failure_handling<'a, T>(
+  combinator: impl Fn(&'a str) -> ParseResult<T>,
+) -> impl Fn(&'a str) -> Result<T, AnyError> {
+  move |input| match combinator(input) {
+    Ok((input, result)) => {
+      if !input.is_empty() {
+        error_for_failure(fail_for_trailing_input(input))
+      } else {
+        Ok(result)
+      }
+    }
+    Err(ParseError::Backtrace) => {
+      error_for_failure(fail_for_trailing_input(input))
+    }
+    Err(ParseError::Failure(e)) => error_for_failure(e),
+  }
+}
+
+fn error_for_failure<T>(e: ParseErrorFailure) -> Result<T, AnyError> {
+  bail!(
+    "{}\n  {}\n  ~",
+    e.message,
+    // truncate the output to prevent wrapping in the console
+    e.input.chars().take(60).collect::<String>()
+  )
+}
+
+fn fail_for_trailing_input(input: &str) -> ParseErrorFailure {
+  ParseErrorFailure::new(input, "Unexpected character.")
+}
diff --git a/cli/npm/semver/mod.rs b/cli/npm/semver/mod.rs
new file mode 100644
index 000000000..2b5cc5a03
--- /dev/null
+++ b/cli/npm/semver/mod.rs
@@ -0,0 +1,956 @@
+// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
+
+use std::cmp::Ordering;
+use std::fmt;
+
+use deno_core::anyhow::Context;
+use deno_core::error::AnyError;
+use monch::*;
+
+use crate::npm::resolution::NpmVersionMatcher;
+
+use self::errors::with_failure_handling;
+use self::range::Partial;
+use self::range::VersionBoundKind;
+use self::range::VersionRange;
+use self::range::VersionRangeSet;
+
+use self::range::XRange;
+pub use self::specifier::SpecifierVersionReq;
+
+mod errors;
+mod range;
+mod specifier;
+
+// A lot of the below is a re-implementation of parts of https://github.com/npm/node-semver
+// which is Copyright (c) Isaac Z. Schlueter and Contributors (ISC License)
+
+#[derive(Clone, Debug, PartialEq, Eq, Default, Hash)]
+pub struct NpmVersion {
+  pub major: u64,
+  pub minor: u64,
+  pub patch: u64,
+  pub pre: Vec<String>,
+  pub build: Vec<String>,
+}
+
+impl fmt::Display for NpmVersion {
+  fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+    write!(f, "{}.{}.{}", self.major, self.minor, self.patch)?;
+    if !self.pre.is_empty() {
+      write!(f, "-")?;
+      for (i, part) in self.pre.iter().enumerate() {
+        if i > 0 {
+          write!(f, ".")?;
+        }
+        write!(f, "{}", part)?;
+      }
+    }
+    if !self.build.is_empty() {
+      write!(f, "+")?;
+      for (i, part) in self.build.iter().enumerate() {
+        if i > 0 {
+          write!(f, ".")?;
+        }
+        write!(f, "{}", part)?;
+      }
+    }
+    Ok(())
+  }
+}
+
+impl std::cmp::PartialOrd for NpmVersion {
+  fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+    Some(self.cmp(other))
+  }
+}
+
+impl std::cmp::Ord for NpmVersion {
+  fn cmp(&self, other: &Self) -> Ordering {
+    let cmp_result = self.major.cmp(&other.major);
+    if cmp_result != Ordering::Equal {
+      return cmp_result;
+    }
+
+    let cmp_result = self.minor.cmp(&other.minor);
+    if cmp_result != Ordering::Equal {
+      return cmp_result;
+    }
+
+    let cmp_result = self.patch.cmp(&other.patch);
+    if cmp_result != Ordering::Equal {
+      return cmp_result;
+    }
+
+    // only compare the pre-release and not the build as node-semver does
+    if self.pre.is_empty() && other.pre.is_empty() {
+      Ordering::Equal
+    } else if !self.pre.is_empty() && other.pre.is_empty() {
+      Ordering::Less
+    } else if self.pre.is_empty() && !other.pre.is_empty() {
+      Ordering::Greater
+    } else {
+      let mut i = 0;
+      loop {
+        let a = self.pre.get(i);
+        let b = other.pre.get(i);
+        if a.is_none() && b.is_none() {
+          return Ordering::Equal;
+        }
+
+        // https://github.com/npm/node-semver/blob/4907647d169948a53156502867ed679268063a9f/internal/identifiers.js
+        let a = match a {
+          Some(a) => a,
+          None => return Ordering::Less,
+        };
+        let b = match b {
+          Some(b) => b,
+          None => return Ordering::Greater,
+        };
+
+        // prefer numbers
+        if let Ok(a_num) = a.parse::<u64>() {
+          if let Ok(b_num) = b.parse::<u64>() {
+            return a_num.cmp(&b_num);
+          } else {
+            return Ordering::Less;
+          }
+        } else if b.parse::<u64>().is_ok() {
+          return Ordering::Greater;
+        }
+
+        let cmp_result = a.cmp(b);
+        if cmp_result != Ordering::Equal {
+          return cmp_result;
+        }
+        i += 1;
+      }
+    }
+  }
+}
+
+impl NpmVersion {
+  pub fn parse(text: &str) -> Result<Self, AnyError> {
+    let text = text.trim();
+    with_failure_handling(parse_npm_version)(text)
+      .with_context(|| format!("Invalid npm version '{}'.", text))
+  }
+}
+
+fn parse_npm_version(input: &str) -> ParseResult<NpmVersion> {
+  let (input, _) = maybe(ch('='))(input)?; // skip leading =
+  let (input, _) = skip_whitespace(input)?;
+  let (input, _) = maybe(ch('v'))(input)?; // skip leading v
+  let (input, _) = skip_whitespace(input)?;
+  let (input, major) = nr(input)?;
+  let (input, _) = ch('.')(input)?;
+  let (input, minor) = nr(input)?;
+  let (input, _) = ch('.')(input)?;
+  let (input, patch) = nr(input)?;
+  let (input, q) = maybe(qualifier)(input)?;
+  let q = q.unwrap_or_default();
+
+  Ok((
+    input,
+    NpmVersion {
+      major,
+      minor,
+      patch,
+      pre: q.pre,
+      build: q.build,
+    },
+  ))
+}
+
+/// A version requirement found in an npm package's dependencies.
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct NpmVersionReq {
+  raw_text: String,
+  range_set: VersionRangeSet,
+}
+
+impl NpmVersionMatcher for NpmVersionReq {
+  fn matches(&self, version: &NpmVersion) -> bool {
+    self.satisfies(version)
+  }
+
+  fn version_text(&self) -> String {
+    self.raw_text.clone()
+  }
+}
+
+impl fmt::Display for NpmVersionReq {
+  fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+    write!(f, "{}", &self.raw_text)
+  }
+}
+
+impl NpmVersionReq {
+  pub fn parse(text: &str) -> Result<Self, AnyError> {
+    let text = text.trim();
+    with_failure_handling(parse_npm_version_req)(text)
+      .with_context(|| format!("Invalid npm version requirement '{}'.", text))
+  }
+
+  pub fn satisfies(&self, version: &NpmVersion) -> bool {
+    self.range_set.satisfies(version)
+  }
+}
+
+fn parse_npm_version_req(input: &str) -> ParseResult<NpmVersionReq> {
+  map(range_set, |set| NpmVersionReq {
+    raw_text: input.to_string(),
+    range_set: set,
+  })(input)
+}
+
+// https://github.com/npm/node-semver/tree/4907647d169948a53156502867ed679268063a9f#range-grammar
+// range-set  ::= range ( logical-or range ) *
+// logical-or ::= ( ' ' ) * '||' ( ' ' ) *
+// range      ::= hyphen | simple ( ' ' simple ) * | ''
+// hyphen     ::= partial ' - ' partial
+// simple     ::= primitive | partial | tilde | caret
+// primitive  ::= ( '<' | '>' | '>=' | '<=' | '=' ) partial
+// partial    ::= xr ( '.' xr ( '.' xr qualifier ? )? )?
+// xr         ::= 'x' | 'X' | '*' | nr
+// nr         ::= '0' | ['1'-'9'] ( ['0'-'9'] ) *
+// tilde      ::= '~' partial
+// caret      ::= '^' partial
+// qualifier  ::= ( '-' pre )? ( '+' build )?
+// pre        ::= parts
+// build      ::= parts
+// parts      ::= part ( '.' part ) *
+// part       ::= nr | [-0-9A-Za-z]+
+
+// range-set ::= range ( logical-or range ) *
+fn range_set(input: &str) -> ParseResult<VersionRangeSet> {
+  if input.is_empty() {
+    return Ok((input, VersionRangeSet(vec![VersionRange::all()])));
+  }
+  map(if_not_empty(separated_list(range, logical_or)), |ranges| {
+    // filter out the ranges that won't match anything for the tests
+    VersionRangeSet(ranges.into_iter().filter(|r| !r.is_none()).collect())
+  })(input)
+}
+
+// range ::= hyphen | simple ( ' ' simple ) * | ''
+fn range(input: &str) -> ParseResult<VersionRange> {
+  or(
+    map(hyphen, |hyphen| VersionRange {
+      start: hyphen.start.as_lower_bound(),
+      end: hyphen.end.as_upper_bound(),
+    }),
+    map(separated_list(simple, whitespace), |ranges| {
+      let mut final_range = VersionRange::all();
+      for range in ranges {
+        final_range = final_range.clamp(&range);
+      }
+      final_range
+    }),
+  )(input)
+}
+
+#[derive(Debug, Clone)]
+struct Hyphen {
+  start: Partial,
+  end: Partial,
+}
+
+// hyphen ::= partial ' - ' partial
+fn hyphen(input: &str) -> ParseResult<Hyphen> {
+  let (input, first) = partial(input)?;
+  let (input, _) = whitespace(input)?;
+  let (input, _) = tag("-")(input)?;
+  let (input, _) = whitespace(input)?;
+  let (input, second) = partial(input)?;
+  Ok((
+    input,
+    Hyphen {
+      start: first,
+      end: second,
+    },
+  ))
+}
+
+// logical-or ::= ( ' ' ) * '||' ( ' ' ) *
+fn logical_or(input: &str) -> ParseResult<&str> {
+  delimited(skip_whitespace, tag("||"), skip_whitespace)(input)
+}
+
+fn skip_whitespace_or_v(input: &str) -> ParseResult<()> {
+  map(
+    pair(skip_whitespace, pair(maybe(ch('v')), skip_whitespace)),
+    |_| (),
+  )(input)
+}
+
+// simple ::= primitive | partial | tilde | caret
+fn simple(input: &str) -> ParseResult<VersionRange> {
+  let tilde = pair(or(tag("~>"), tag("~")), skip_whitespace_or_v);
+  or4(
+    map(preceded(tilde, partial), |partial| {
+      partial.as_tilde_version_range()
+    }),
+    map(
+      preceded(pair(ch('^'), skip_whitespace_or_v), partial),
+      |partial| partial.as_caret_version_range(),
+    ),
+    map(primitive, |primitive| {
+      let partial = primitive.partial;
+      match primitive.kind {
+        PrimitiveKind::Equal => partial.as_equal_range(),
+        PrimitiveKind::GreaterThan => {
+          partial.as_greater_than(VersionBoundKind::Exclusive)
+        }
+        PrimitiveKind::GreaterThanOrEqual => {
+          partial.as_greater_than(VersionBoundKind::Inclusive)
+        }
+        PrimitiveKind::LessThan => {
+          partial.as_less_than(VersionBoundKind::Exclusive)
+        }
+        PrimitiveKind::LessThanOrEqual => {
+          partial.as_less_than(VersionBoundKind::Inclusive)
+        }
+      }
+    }),
+    map(partial, |partial| {
+      partial.as_greater_range(VersionBoundKind::Inclusive)
+    }),
+  )(input)
+}
+
+#[derive(Debug, Clone, Copy)]
+enum PrimitiveKind {
+  GreaterThan,
+  LessThan,
+  GreaterThanOrEqual,
+  LessThanOrEqual,
+  Equal,
+}
+
+#[derive(Debug, Clone)]
+struct Primitive {
+  kind: PrimitiveKind,
+  partial: Partial,
+}
+
+fn primitive(input: &str) -> ParseResult<Primitive> {
+  let (input, kind) = primitive_kind(input)?;
+  let (input, _) = skip_whitespace(input)?;
+  let (input, partial) = partial(input)?;
+  Ok((input, Primitive { kind, partial }))
+}
+
+fn primitive_kind(input: &str) -> ParseResult<PrimitiveKind> {
+  or5(
+    map(tag(">="), |_| PrimitiveKind::GreaterThanOrEqual),
+    map(tag("<="), |_| PrimitiveKind::LessThanOrEqual),
+    map(ch('<'), |_| PrimitiveKind::LessThan),
+    map(ch('>'), |_| PrimitiveKind::GreaterThan),
+    map(ch('='), |_| PrimitiveKind::Equal),
+  )(input)
+}
+
+// partial ::= xr ( '.' xr ( '.' xr qualifier ? )? )?
+fn partial(input: &str) -> ParseResult<Partial> {
+  let (input, _) = maybe(ch('v'))(input)?; // skip leading v
+  let (input, major) = xr()(input)?;
+  let (input, maybe_minor) = maybe(preceded(ch('.'), xr()))(input)?;
+  let (input, maybe_patch) = if maybe_minor.is_some() {
+    maybe(preceded(ch('.'), xr()))(input)?
+  } else {
+    (input, None)
+  };
+  let (input, qual) = if maybe_patch.is_some() {
+    maybe(qualifier)(input)?
+  } else {
+    (input, None)
+  };
+  let qual = qual.unwrap_or_default();
+  Ok((
+    input,
+    Partial {
+      major,
+      minor: maybe_minor.unwrap_or(XRange::Wildcard),
+      patch: maybe_patch.unwrap_or(XRange::Wildcard),
+      pre: qual.pre,
+      build: qual.build,
+    },
+  ))
+}
+
+// xr ::= 'x' | 'X' | '*' | nr
+fn xr<'a>() -> impl Fn(&'a str) -> ParseResult<'a, XRange> {
+  or(
+    map(or3(tag("x"), tag("X"), tag("*")), |_| XRange::Wildcard),
+    map(nr, XRange::Val),
+  )
+}
+
+// nr ::= '0' | ['1'-'9'] ( ['0'-'9'] ) *
+fn nr(input: &str) -> ParseResult<u64> {
+  // we do loose parsing to support people doing stuff like 01.02.03
+  let (input, result) =
+    if_not_empty(substring(skip_while(|c| c.is_ascii_digit())))(input)?;
+  let val = match result.parse::<u64>() {
+    Ok(val) => val,
+    Err(err) => {
+      return ParseError::fail(
+        input,
+        format!("Error parsing '{}' to u64.\n\n{:#}", result, err),
+      )
+    }
+  };
+  Ok((input, val))
+}
+
+#[derive(Debug, Clone, Default)]
+struct Qualifier {
+  pre: Vec<String>,
+  build: Vec<String>,
+}
+
+// qualifier ::= ( '-' pre )? ( '+' build )?
+fn qualifier(input: &str) -> ParseResult<Qualifier> {
+  let (input, pre_parts) = maybe(pre)(input)?;
+  let (input, build_parts) = maybe(build)(input)?;
+  Ok((
+    input,
+    Qualifier {
+      pre: pre_parts.unwrap_or_default(),
+      build: build_parts.unwrap_or_default(),
+    },
+  ))
+}
+
+// pre ::= parts
+fn pre(input: &str) -> ParseResult<Vec<String>> {
+  preceded(maybe(ch('-')), parts)(input)
+}
+
+// build ::= parts
+fn build(input: &str) -> ParseResult<Vec<String>> {
+  preceded(ch('+'), parts)(input)
+}
+
+// parts ::= part ( '.' part ) *
+fn parts(input: &str) -> ParseResult<Vec<String>> {
+  if_not_empty(map(separated_list(part, ch('.')), |text| {
+    text.into_iter().map(ToOwned::to_owned).collect()
+  }))(input)
+}
+
+// part ::= nr | [-0-9A-Za-z]+
+fn part(input: &str) -> ParseResult<&str> {
+  // nr is in the other set, so don't bother checking for it
+  if_true(
+    take_while(|c| c.is_ascii_alphanumeric() || c == '-'),
+    |result| !result.is_empty(),
+  )(input)
+}
+
+#[cfg(test)]
+mod tests {
+  use pretty_assertions::assert_eq;
+  use std::cmp::Ordering;
+
+  use super::*;
+
+  struct NpmVersionReqTester(NpmVersionReq);
+
+  impl NpmVersionReqTester {
+    fn new(text: &str) -> Self {
+      Self(NpmVersionReq::parse(text).unwrap())
+    }
+
+    fn matches(&self, version: &str) -> bool {
+      self.0.matches(&NpmVersion::parse(version).unwrap())
+    }
+  }
+
+  #[test]
+  pub fn npm_version_req_with_v() {
+    assert!(NpmVersionReq::parse("v1.0.0").is_ok());
+  }
+
+  #[test]
+  pub fn npm_version_req_exact() {
+    let tester = NpmVersionReqTester::new("2.1.2");
+    assert!(!tester.matches("2.1.1"));
+    assert!(tester.matches("2.1.2"));
+    assert!(!tester.matches("2.1.3"));
+
+    let tester = NpmVersionReqTester::new("2.1.2 || 2.1.5");
+    assert!(!tester.matches("2.1.1"));
+    assert!(tester.matches("2.1.2"));
+    assert!(!tester.matches("2.1.3"));
+    assert!(!tester.matches("2.1.4"));
+    assert!(tester.matches("2.1.5"));
+    assert!(!tester.matches("2.1.6"));
+  }
+
+  #[test]
+  pub fn npm_version_req_minor() {
+    let tester = NpmVersionReqTester::new("1.1");
+    assert!(!tester.matches("1.0.0"));
+    assert!(tester.matches("1.1.0"));
+    assert!(tester.matches("1.1.1"));
+    assert!(!tester.matches("1.2.0"));
+    assert!(!tester.matches("1.2.1"));
+  }
+
+  #[test]
+  pub fn npm_version_req_ranges() {
+    let tester = NpmVersionReqTester::new(">= 2.1.2 < 3.0.0 || 5.x");
+    assert!(!tester.matches("2.1.1"));
+    assert!(tester.matches("2.1.2"));
+    assert!(tester.matches("2.9.9"));
+    assert!(!tester.matches("3.0.0"));
+    assert!(tester.matches("5.0.0"));
+    assert!(tester.matches("5.1.0"));
+    assert!(!tester.matches("6.1.0"));
+  }
+
+  macro_rules! assert_cmp {
+    ($a:expr, $b:expr, $expected:expr) => {
+      assert_eq!(
+        $a.cmp(&$b),
+        $expected,
+        "expected {} to be {:?} {}",
+        $a,
+        $expected,
+        $b
+      );
+    };
+  }
+
+  macro_rules! test_compare {
+    ($a:expr, $b:expr, $expected:expr) => {
+      let a = NpmVersion::parse($a).unwrap();
+      let b = NpmVersion::parse($b).unwrap();
+      assert_cmp!(a, b, $expected);
+    };
+  }
+
+  #[test]
+  fn version_compare() {
+    test_compare!("1.2.3", "2.3.4", Ordering::Less);
+    test_compare!("1.2.3", "1.2.4", Ordering::Less);
+    test_compare!("1.2.3", "1.2.3", Ordering::Equal);
+    test_compare!("1.2.3", "1.2.2", Ordering::Greater);
+    test_compare!("1.2.3", "1.1.5", Ordering::Greater);
+  }
+
+  #[test]
+  fn version_compare_equal() {
+    // https://github.com/npm/node-semver/blob/bce42589d33e1a99454530a8fd52c7178e2b11c1/test/fixtures/equality.js
+    let fixtures = &[
+      ("1.2.3", "v1.2.3"),
+      ("1.2.3", "=1.2.3"),
+      ("1.2.3", "v 1.2.3"),
+      ("1.2.3", "= 1.2.3"),
+      ("1.2.3", " v1.2.3"),
+      ("1.2.3", " =1.2.3"),
+      ("1.2.3", " v 1.2.3"),
+      ("1.2.3", " = 1.2.3"),
+      ("1.2.3-0", "v1.2.3-0"),
+      ("1.2.3-0", "=1.2.3-0"),
+      ("1.2.3-0", "v 1.2.3-0"),
+      ("1.2.3-0", "= 1.2.3-0"),
+      ("1.2.3-0", " v1.2.3-0"),
+      ("1.2.3-0", " =1.2.3-0"),
+      ("1.2.3-0", " v 1.2.3-0"),
+      ("1.2.3-0", " = 1.2.3-0"),
+      ("1.2.3-1", "v1.2.3-1"),
+      ("1.2.3-1", "=1.2.3-1"),
+      ("1.2.3-1", "v 1.2.3-1"),
+      ("1.2.3-1", "= 1.2.3-1"),
+      ("1.2.3-1", " v1.2.3-1"),
+      ("1.2.3-1", " =1.2.3-1"),
+      ("1.2.3-1", " v 1.2.3-1"),
+      ("1.2.3-1", " = 1.2.3-1"),
+      ("1.2.3-beta", "v1.2.3-beta"),
+      ("1.2.3-beta", "=1.2.3-beta"),
+      ("1.2.3-beta", "v 1.2.3-beta"),
+      ("1.2.3-beta", "= 1.2.3-beta"),
+      ("1.2.3-beta", " v1.2.3-beta"),
+      ("1.2.3-beta", " =1.2.3-beta"),
+      ("1.2.3-beta", " v 1.2.3-beta"),
+      ("1.2.3-beta", " = 1.2.3-beta"),
+      ("1.2.3-beta+build", " = 1.2.3-beta+otherbuild"),
+      ("1.2.3+build", " = 1.2.3+otherbuild"),
+      ("1.2.3-beta+build", "1.2.3-beta+otherbuild"),
+      ("1.2.3+build", "1.2.3+otherbuild"),
+      ("  v1.2.3+build", "1.2.3+otherbuild"),
+    ];
+    for (a, b) in fixtures {
+      test_compare!(a, b, Ordering::Equal);
+    }
+  }
+
+  #[test]
+  fn version_comparisons_test() {
+    // https://github.com/npm/node-semver/blob/bce42589d33e1a99454530a8fd52c7178e2b11c1/test/fixtures/comparisons.js
+    let fixtures = &[
+      ("0.0.0", "0.0.0-foo"),
+      ("0.0.1", "0.0.0"),
+      ("1.0.0", "0.9.9"),
+      ("0.10.0", "0.9.0"),
+      ("0.99.0", "0.10.0"),
+      ("2.0.0", "1.2.3"),
+      ("v0.0.0", "0.0.0-foo"),
+      ("v0.0.1", "0.0.0"),
+      ("v1.0.0", "0.9.9"),
+      ("v0.10.0", "0.9.0"),
+      ("v0.99.0", "0.10.0"),
+      ("v2.0.0", "1.2.3"),
+      ("0.0.0", "v0.0.0-foo"),
+      ("0.0.1", "v0.0.0"),
+      ("1.0.0", "v0.9.9"),
+      ("0.10.0", "v0.9.0"),
+      ("0.99.0", "v0.10.0"),
+      ("2.0.0", "v1.2.3"),
+      ("1.2.3", "1.2.3-asdf"),
+      ("1.2.3", "1.2.3-4"),
+      ("1.2.3", "1.2.3-4-foo"),
+      ("1.2.3-5-foo", "1.2.3-5"),
+      ("1.2.3-5", "1.2.3-4"),
+      ("1.2.3-5-foo", "1.2.3-5-Foo"),
+      ("3.0.0", "2.7.2+asdf"),
+      ("1.2.3-a.10", "1.2.3-a.5"),
+      ("1.2.3-a.b", "1.2.3-a.5"),
+      ("1.2.3-a.b", "1.2.3-a"),
+      ("1.2.3-a.b.c.10.d.5", "1.2.3-a.b.c.5.d.100"),
+      ("1.2.3-r2", "1.2.3-r100"),
+      ("1.2.3-r100", "1.2.3-R2"),
+    ];
+    for (a, b) in fixtures {
+      let a = NpmVersion::parse(a).unwrap();
+      let b = NpmVersion::parse(b).unwrap();
+      assert_cmp!(a, b, Ordering::Greater);
+      assert_cmp!(b, a, Ordering::Less);
+      assert_cmp!(a, a, Ordering::Equal);
+      assert_cmp!(b, b, Ordering::Equal);
+    }
+  }
+
+  #[test]
+  fn range_parse() {
+    // https://github.com/npm/node-semver/blob/4907647d169948a53156502867ed679268063a9f/test/fixtures/range-parse.js
+    let fixtures = &[
+      ("1.0.0 - 2.0.0", ">=1.0.0 <=2.0.0"),
+      ("1 - 2", ">=1.0.0 <3.0.0-0"),
+      ("1.0 - 2.0", ">=1.0.0 <2.1.0-0"),
+      ("1.0.0", "1.0.0"),
+      (">=*", "*"),
+      ("", "*"),
+      ("*", "*"),
+      ("*", "*"),
+      (">=1.0.0", ">=1.0.0"),
+      (">1.0.0", ">1.0.0"),
+      ("<=2.0.0", "<=2.0.0"),
+      ("1", ">=1.0.0 <2.0.0-0"),
+      ("<=2.0.0", "<=2.0.0"),
+      ("<=2.0.0", "<=2.0.0"),
+      ("<2.0.0", "<2.0.0"),
+      ("<2.0.0", "<2.0.0"),
+      (">= 1.0.0", ">=1.0.0"),
+      (">=  1.0.0", ">=1.0.0"),
+      (">=   1.0.0", ">=1.0.0"),
+      ("> 1.0.0", ">1.0.0"),
+      (">  1.0.0", ">1.0.0"),
+      ("<=   2.0.0", "<=2.0.0"),
+      ("<= 2.0.0", "<=2.0.0"),
+      ("<=  2.0.0", "<=2.0.0"),
+      ("<    2.0.0", "<2.0.0"),
+      ("<\t2.0.0", "<2.0.0"),
+      (">=0.1.97", ">=0.1.97"),
+      (">=0.1.97", ">=0.1.97"),
+      ("0.1.20 || 1.2.4", "0.1.20||1.2.4"),
+      (">=0.2.3 || <0.0.1", ">=0.2.3||<0.0.1"),
+      (">=0.2.3 || <0.0.1", ">=0.2.3||<0.0.1"),
+      (">=0.2.3 || <0.0.1", ">=0.2.3||<0.0.1"),
+      ("||", "*"),
+      ("2.x.x", ">=2.0.0 <3.0.0-0"),
+      ("1.2.x", ">=1.2.0 <1.3.0-0"),
+      ("1.2.x || 2.x", ">=1.2.0 <1.3.0-0||>=2.0.0 <3.0.0-0"),
+      ("1.2.x || 2.x", ">=1.2.0 <1.3.0-0||>=2.0.0 <3.0.0-0"),
+      ("x", "*"),
+      ("2.*.*", ">=2.0.0 <3.0.0-0"),
+      ("1.2.*", ">=1.2.0 <1.3.0-0"),
+      ("1.2.* || 2.*", ">=1.2.0 <1.3.0-0||>=2.0.0 <3.0.0-0"),
+      ("*", "*"),
+      ("2", ">=2.0.0 <3.0.0-0"),
+      ("2.3", ">=2.3.0 <2.4.0-0"),
+      ("~2.4", ">=2.4.0 <2.5.0-0"),
+      ("~2.4", ">=2.4.0 <2.5.0-0"),
+      ("~>3.2.1", ">=3.2.1 <3.3.0-0"),
+      ("~1", ">=1.0.0 <2.0.0-0"),
+      ("~>1", ">=1.0.0 <2.0.0-0"),
+      ("~> 1", ">=1.0.0 <2.0.0-0"),
+      ("~1.0", ">=1.0.0 <1.1.0-0"),
+      ("~ 1.0", ">=1.0.0 <1.1.0-0"),
+      ("^0", "<1.0.0-0"),
+      ("^ 1", ">=1.0.0 <2.0.0-0"),
+      ("^0.1", ">=0.1.0 <0.2.0-0"),
+      ("^1.0", ">=1.0.0 <2.0.0-0"),
+      ("^1.2", ">=1.2.0 <2.0.0-0"),
+      ("^0.0.1", ">=0.0.1 <0.0.2-0"),
+      ("^0.0.1-beta", ">=0.0.1-beta <0.0.2-0"),
+      ("^0.1.2", ">=0.1.2 <0.2.0-0"),
+      ("^1.2.3", ">=1.2.3 <2.0.0-0"),
+      ("^1.2.3-beta.4", ">=1.2.3-beta.4 <2.0.0-0"),
+      ("<1", "<1.0.0-0"),
+      ("< 1", "<1.0.0-0"),
+      (">=1", ">=1.0.0"),
+      (">= 1", ">=1.0.0"),
+      ("<1.2", "<1.2.0-0"),
+      ("< 1.2", "<1.2.0-0"),
+      ("1", ">=1.0.0 <2.0.0-0"),
+      ("^ 1.2 ^ 1", ">=1.2.0 <2.0.0-0 >=1.0.0"),
+      ("1.2 - 3.4.5", ">=1.2.0 <=3.4.5"),
+      ("1.2.3 - 3.4", ">=1.2.3 <3.5.0-0"),
+      ("1.2 - 3.4", ">=1.2.0 <3.5.0-0"),
+      (">1", ">=2.0.0"),
+      (">1.2", ">=1.3.0"),
+      (">X", "<0.0.0-0"),
+      ("<X", "<0.0.0-0"),
+      ("<x <* || >* 2.x", "<0.0.0-0"),
+      (">x 2.x || * || <x", "*"),
+      (">01.02.03", ">1.2.3"),
+      ("~1.2.3beta", ">=1.2.3-beta <1.3.0-0"),
+      (">=09090", ">=9090.0.0"),
+    ];
+    for (range_text, expected) in fixtures {
+      let range = NpmVersionReq::parse(range_text).unwrap();
+      let expected_range = NpmVersionReq::parse(expected).unwrap();
+      assert_eq!(
+        range.range_set, expected_range.range_set,
+        "failed for {} and {}",
+        range_text, expected
+      );
+    }
+  }
+
+  #[test]
+  fn range_satisfies() {
+    // https://github.com/npm/node-semver/blob/4907647d169948a53156502867ed679268063a9f/test/fixtures/range-include.js
+    let fixtures = &[
+      ("1.0.0 - 2.0.0", "1.2.3"),
+      ("^1.2.3+build", "1.2.3"),
+      ("^1.2.3+build", "1.3.0"),
+      ("1.2.3-pre+asdf - 2.4.3-pre+asdf", "1.2.3"),
+      ("1.2.3pre+asdf - 2.4.3-pre+asdf", "1.2.3"),
+      ("1.2.3-pre+asdf - 2.4.3pre+asdf", "1.2.3"),
+      ("1.2.3pre+asdf - 2.4.3pre+asdf", "1.2.3"),
+      ("1.2.3-pre+asdf - 2.4.3-pre+asdf", "1.2.3-pre.2"),
+      ("1.2.3-pre+asdf - 2.4.3-pre+asdf", "2.4.3-alpha"),
+      ("1.2.3+asdf - 2.4.3+asdf", "1.2.3"),
+      ("1.0.0", "1.0.0"),
+      (">=*", "0.2.4"),
+      ("", "1.0.0"),
+      ("*", "1.2.3"),
+      ("*", "v1.2.3"),
+      (">=1.0.0", "1.0.0"),
+      (">=1.0.0", "1.0.1"),
+      (">=1.0.0", "1.1.0"),
+      (">1.0.0", "1.0.1"),
+      (">1.0.0", "1.1.0"),
+      ("<=2.0.0", "2.0.0"),
+      ("<=2.0.0", "1.9999.9999"),
+      ("<=2.0.0", "0.2.9"),
+      ("<2.0.0", "1.9999.9999"),
+      ("<2.0.0", "0.2.9"),
+      (">= 1.0.0", "1.0.0"),
+      (">=  1.0.0", "1.0.1"),
+      (">=   1.0.0", "1.1.0"),
+      ("> 1.0.0", "1.0.1"),
+      (">  1.0.0", "1.1.0"),
+      ("<=   2.0.0", "2.0.0"),
+      ("<= 2.0.0", "1.9999.9999"),
+      ("<=  2.0.0", "0.2.9"),
+      ("<    2.0.0", "1.9999.9999"),
+      ("<\t2.0.0", "0.2.9"),
+      (">=0.1.97", "v0.1.97"),
+      (">=0.1.97", "0.1.97"),
+      ("0.1.20 || 1.2.4", "1.2.4"),
+      (">=0.2.3 || <0.0.1", "0.0.0"),
+      (">=0.2.3 || <0.0.1", "0.2.3"),
+      (">=0.2.3 || <0.0.1", "0.2.4"),
+      ("||", "1.3.4"),
+      ("2.x.x", "2.1.3"),
+      ("1.2.x", "1.2.3"),
+      ("1.2.x || 2.x", "2.1.3"),
+      ("1.2.x || 2.x", "1.2.3"),
+      ("x", "1.2.3"),
+      ("2.*.*", "2.1.3"),
+      ("1.2.*", "1.2.3"),
+      ("1.2.* || 2.*", "2.1.3"),
+      ("1.2.* || 2.*", "1.2.3"),
+      ("*", "1.2.3"),
+      ("2", "2.1.2"),
+      ("2.3", "2.3.1"),
+      ("~0.0.1", "0.0.1"),
+      ("~0.0.1", "0.0.2"),
+      ("~x", "0.0.9"),   // >=2.4.0 <2.5.0
+      ("~2", "2.0.9"),   // >=2.4.0 <2.5.0
+      ("~2.4", "2.4.0"), // >=2.4.0 <2.5.0
+      ("~2.4", "2.4.5"),
+      ("~>3.2.1", "3.2.2"), // >=3.2.1 <3.3.0,
+      ("~1", "1.2.3"),      // >=1.0.0 <2.0.0
+      ("~>1", "1.2.3"),
+      ("~> 1", "1.2.3"),
+      ("~1.0", "1.0.2"), // >=1.0.0 <1.1.0,
+      ("~ 1.0", "1.0.2"),
+      ("~ 1.0.3", "1.0.12"),
+      ("~ 1.0.3alpha", "1.0.12"),
+      (">=1", "1.0.0"),
+      (">= 1", "1.0.0"),
+      ("<1.2", "1.1.1"),
+      ("< 1.2", "1.1.1"),
+      ("~v0.5.4-pre", "0.5.5"),
+      ("~v0.5.4-pre", "0.5.4"),
+      ("=0.7.x", "0.7.2"),
+      ("<=0.7.x", "0.7.2"),
+      (">=0.7.x", "0.7.2"),
+      ("<=0.7.x", "0.6.2"),
+      ("~1.2.1 >=1.2.3", "1.2.3"),
+      ("~1.2.1 =1.2.3", "1.2.3"),
+      ("~1.2.1 1.2.3", "1.2.3"),
+      ("~1.2.1 >=1.2.3 1.2.3", "1.2.3"),
+      ("~1.2.1 1.2.3 >=1.2.3", "1.2.3"),
+      ("~1.2.1 1.2.3", "1.2.3"),
+      (">=1.2.1 1.2.3", "1.2.3"),
+      ("1.2.3 >=1.2.1", "1.2.3"),
+      (">=1.2.3 >=1.2.1", "1.2.3"),
+      (">=1.2.1 >=1.2.3", "1.2.3"),
+      (">=1.2", "1.2.8"),
+      ("^1.2.3", "1.8.1"),
+      ("^0.1.2", "0.1.2"),
+      ("^0.1", "0.1.2"),
+      ("^0.0.1", "0.0.1"),
+      ("^1.2", "1.4.2"),
+      ("^1.2 ^1", "1.4.2"),
+      ("^1.2.3-alpha", "1.2.3-pre"),
+      ("^1.2.0-alpha", "1.2.0-pre"),
+      ("^0.0.1-alpha", "0.0.1-beta"),
+      ("^0.0.1-alpha", "0.0.1"),
+      ("^0.1.1-alpha", "0.1.1-beta"),
+      ("^x", "1.2.3"),
+      ("x - 1.0.0", "0.9.7"),
+      ("x - 1.x", "0.9.7"),
+      ("1.0.0 - x", "1.9.7"),
+      ("1.x - x", "1.9.7"),
+      ("<=7.x", "7.9.9"),
+    ];
+    for (req_text, version_text) in fixtures {
+      let req = NpmVersionReq::parse(req_text).unwrap();
+      let version = NpmVersion::parse(version_text).unwrap();
+      assert!(
+        req.satisfies(&version),
+        "Checking {} satisfies {}",
+        req_text,
+        version_text
+      );
+    }
+  }
+
+  #[test]
+  fn range_not_satisfies() {
+    let fixtures = &[
+      ("1.0.0 - 2.0.0", "2.2.3"),
+      ("1.2.3+asdf - 2.4.3+asdf", "1.2.3-pre.2"),
+      ("1.2.3+asdf - 2.4.3+asdf", "2.4.3-alpha"),
+      ("^1.2.3+build", "2.0.0"),
+      ("^1.2.3+build", "1.2.0"),
+      ("^1.2.3", "1.2.3-pre"),
+      ("^1.2", "1.2.0-pre"),
+      (">1.2", "1.3.0-beta"),
+      ("<=1.2.3", "1.2.3-beta"),
+      ("^1.2.3", "1.2.3-beta"),
+      ("=0.7.x", "0.7.0-asdf"),
+      (">=0.7.x", "0.7.0-asdf"),
+      ("<=0.7.x", "0.7.0-asdf"),
+      ("1", "1.0.0beta"),
+      ("<1", "1.0.0beta"),
+      ("< 1", "1.0.0beta"),
+      ("1.0.0", "1.0.1"),
+      (">=1.0.0", "0.0.0"),
+      (">=1.0.0", "0.0.1"),
+      (">=1.0.0", "0.1.0"),
+      (">1.0.0", "0.0.1"),
+      (">1.0.0", "0.1.0"),
+      ("<=2.0.0", "3.0.0"),
+      ("<=2.0.0", "2.9999.9999"),
+      ("<=2.0.0", "2.2.9"),
+      ("<2.0.0", "2.9999.9999"),
+      ("<2.0.0", "2.2.9"),
+      (">=0.1.97", "v0.1.93"),
+      (">=0.1.97", "0.1.93"),
+      ("0.1.20 || 1.2.4", "1.2.3"),
+      (">=0.2.3 || <0.0.1", "0.0.3"),
+      (">=0.2.3 || <0.0.1", "0.2.2"),
+      ("2.x.x", "1.1.3"),
+      ("2.x.x", "3.1.3"),
+      ("1.2.x", "1.3.3"),
+      ("1.2.x || 2.x", "3.1.3"),
+      ("1.2.x || 2.x", "1.1.3"),
+      ("2.*.*", "1.1.3"),
+      ("2.*.*", "3.1.3"),
+      ("1.2.*", "1.3.3"),
+      ("1.2.* || 2.*", "3.1.3"),
+      ("1.2.* || 2.*", "1.1.3"),
+      ("2", "1.1.2"),
+      ("2.3", "2.4.1"),
+      ("~0.0.1", "0.1.0-alpha"),
+      ("~0.0.1", "0.1.0"),
+      ("~2.4", "2.5.0"), // >=2.4.0 <2.5.0
+      ("~2.4", "2.3.9"),
+      ("~>3.2.1", "3.3.2"), // >=3.2.1 <3.3.0
+      ("~>3.2.1", "3.2.0"), // >=3.2.1 <3.3.0
+      ("~1", "0.2.3"),      // >=1.0.0 <2.0.0
+      ("~>1", "2.2.3"),
+      ("~1.0", "1.1.0"), // >=1.0.0 <1.1.0
+      ("<1", "1.0.0"),
+      (">=1.2", "1.1.1"),
+      ("1", "2.0.0beta"),
+      ("~v0.5.4-beta", "0.5.4-alpha"),
+      ("=0.7.x", "0.8.2"),
+      (">=0.7.x", "0.6.2"),
+      ("<0.7.x", "0.7.2"),
+      ("<1.2.3", "1.2.3-beta"),
+      ("=1.2.3", "1.2.3-beta"),
+      (">1.2", "1.2.8"),
+      ("^0.0.1", "0.0.2-alpha"),
+      ("^0.0.1", "0.0.2"),
+      ("^1.2.3", "2.0.0-alpha"),
+      ("^1.2.3", "1.2.2"),
+      ("^1.2", "1.1.9"),
+      ("*", "v1.2.3-foo"),
+      ("^1.0.0", "2.0.0-rc1"),
+      ("1 - 2", "2.0.0-pre"),
+      ("1 - 2", "1.0.0-pre"),
+      ("1.0 - 2", "1.0.0-pre"),
+      ("1.1.x", "1.0.0-a"),
+      ("1.1.x", "1.1.0-a"),
+      ("1.1.x", "1.2.0-a"),
+      ("1.x", "1.0.0-a"),
+      ("1.x", "1.1.0-a"),
+      ("1.x", "1.2.0-a"),
+      (">=1.0.0 <1.1.0", "1.1.0"),
+      (">=1.0.0 <1.1.0", "1.1.0-pre"),
+      (">=1.0.0 <1.1.0-pre", "1.1.0-pre"),
+    ];
+
+    for (req_text, version_text) in fixtures {
+      let req = NpmVersionReq::parse(req_text).unwrap();
+      let version = NpmVersion::parse(version_text).unwrap();
+      assert!(
+        !req.satisfies(&version),
+        "Checking {} not satisfies {}",
+        req_text,
+        version_text
+      );
+    }
+  }
+}
diff --git a/cli/npm/semver/range.rs b/cli/npm/semver/range.rs
new file mode 100644
index 000000000..faf11580b
--- /dev/null
+++ b/cli/npm/semver/range.rs
@@ -0,0 +1,506 @@
+// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
+
+use std::cmp::Ordering;
+
+use super::NpmVersion;
+
+/// Collection of ranges.
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct VersionRangeSet(pub Vec<VersionRange>);
+
+impl VersionRangeSet {
+  pub fn satisfies(&self, version: &NpmVersion) -> bool {
+    self.0.iter().any(|r| r.satisfies(version))
+  }
+}
+
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub enum RangeBound {
+  Version(VersionBound),
+  Unbounded, // matches everything
+}
+
+impl RangeBound {
+  pub fn inclusive(version: NpmVersion) -> Self {
+    Self::version(VersionBoundKind::Inclusive, version)
+  }
+
+  pub fn exclusive(version: NpmVersion) -> Self {
+    Self::version(VersionBoundKind::Exclusive, version)
+  }
+
+  pub fn version(kind: VersionBoundKind, version: NpmVersion) -> Self {
+    Self::Version(VersionBound::new(kind, version))
+  }
+
+  pub fn clamp_start(&self, other: &RangeBound) -> RangeBound {
+    match &self {
+      RangeBound::Unbounded => other.clone(),
+      RangeBound::Version(self_bound) => RangeBound::Version(match &other {
+        RangeBound::Unbounded => self_bound.clone(),
+        RangeBound::Version(other_bound) => {
+          match self_bound.version.cmp(&other_bound.version) {
+            Ordering::Greater => self_bound.clone(),
+            Ordering::Less => other_bound.clone(),
+            Ordering::Equal => match self_bound.kind {
+              VersionBoundKind::Exclusive => self_bound.clone(),
+              VersionBoundKind::Inclusive => other_bound.clone(),
+            },
+          }
+        }
+      }),
+    }
+  }
+
+  pub fn clamp_end(&self, other: &RangeBound) -> RangeBound {
+    match &self {
+      RangeBound::Unbounded => other.clone(),
+      RangeBound::Version(self_bound) => {
+        RangeBound::Version(match other {
+          RangeBound::Unbounded => self_bound.clone(),
+          RangeBound::Version(other_bound) => {
+            match self_bound.version.cmp(&other_bound.version) {
+              // difference with above is the next two lines are switched
+              Ordering::Greater => other_bound.clone(),
+              Ordering::Less => self_bound.clone(),
+              Ordering::Equal => match self_bound.kind {
+                VersionBoundKind::Exclusive => self_bound.clone(),
+                VersionBoundKind::Inclusive => other_bound.clone(),
+              },
+            }
+          }
+        })
+      }
+    }
+  }
+
+  pub fn has_pre_with_exact_major_minor_patch(
+    &self,
+    version: &NpmVersion,
+  ) -> bool {
+    if let RangeBound::Version(self_version) = &self {
+      if !self_version.version.pre.is_empty()
+        && self_version.version.major == version.major
+        && self_version.version.minor == version.minor
+        && self_version.version.patch == version.patch
+      {
+        return true;
+      }
+    }
+    false
+  }
+}
+
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub enum VersionBoundKind {
+  Inclusive,
+  Exclusive,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct VersionBound {
+  pub kind: VersionBoundKind,
+  pub version: NpmVersion,
+}
+
+impl VersionBound {
+  pub fn new(kind: VersionBoundKind, version: NpmVersion) -> Self {
+    Self { kind, version }
+  }
+}
+
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct VersionRange {
+  pub start: RangeBound,
+  pub end: RangeBound,
+}
+
+impl VersionRange {
+  pub fn all() -> VersionRange {
+    VersionRange {
+      start: RangeBound::Version(VersionBound {
+        kind: VersionBoundKind::Inclusive,
+        version: NpmVersion::default(),
+      }),
+      end: RangeBound::Unbounded,
+    }
+  }
+
+  pub fn none() -> VersionRange {
+    VersionRange {
+      start: RangeBound::Version(VersionBound {
+        kind: VersionBoundKind::Inclusive,
+        version: NpmVersion::default(),
+      }),
+      end: RangeBound::Version(VersionBound {
+        kind: VersionBoundKind::Exclusive,
+        version: NpmVersion::default(),
+      }),
+    }
+  }
+
+  /// If this range won't match anything.
+  pub fn is_none(&self) -> bool {
+    if let RangeBound::Version(end) = &self.end {
+      end.kind == VersionBoundKind::Exclusive
+        && end.version.major == 0
+        && end.version.minor == 0
+        && end.version.patch == 0
+    } else {
+      false
+    }
+  }
+
+  pub fn satisfies(&self, version: &NpmVersion) -> bool {
+    let satisfies = self.min_satisfies(version) && self.max_satisfies(version);
+    if satisfies && !version.pre.is_empty() {
+      // check either side of the range has a pre and same version
+      self.start.has_pre_with_exact_major_minor_patch(version)
+        || self.end.has_pre_with_exact_major_minor_patch(version)
+    } else {
+      satisfies
+    }
+  }
+
+  fn min_satisfies(&self, version: &NpmVersion) -> bool {
+    match &self.start {
+      RangeBound::Unbounded => true,
+      RangeBound::Version(bound) => match version.cmp(&bound.version) {
+        Ordering::Less => false,
+        Ordering::Equal => bound.kind == VersionBoundKind::Inclusive,
+        Ordering::Greater => true,
+      },
+    }
+  }
+
+  fn max_satisfies(&self, version: &NpmVersion) -> bool {
+    match &self.end {
+      RangeBound::Unbounded => true,
+      RangeBound::Version(bound) => match version.cmp(&bound.version) {
+        Ordering::Less => true,
+        Ordering::Equal => bound.kind == VersionBoundKind::Inclusive,
+        Ordering::Greater => false,
+      },
+    }
+  }
+
+  pub fn clamp(&self, range: &VersionRange) -> VersionRange {
+    let start = self.start.clamp_start(&range.start);
+    let end = self.end.clamp_end(&range.end);
+    // clamp the start range to the end when greater
+    let start = start.clamp_end(&end);
+    VersionRange { start, end }
+  }
+}
+
+/// A range that could be a wildcard or number value.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum XRange {
+  Wildcard,
+  Val(u64),
+}
+
+/// A partial version.
+#[derive(Debug, Clone)]
+pub struct Partial {
+  pub major: XRange,
+  pub minor: XRange,
+  pub patch: XRange,
+  pub pre: Vec<String>,
+  pub build: Vec<String>,
+}
+
+impl Partial {
+  pub fn as_tilde_version_range(&self) -> VersionRange {
+    // tilde ranges allow patch-level changes
+    let end = match self.major {
+      XRange::Wildcard => return VersionRange::all(),
+      XRange::Val(major) => match self.minor {
+        XRange::Wildcard => NpmVersion {
+          major: major + 1,
+          minor: 0,
+          patch: 0,
+          pre: Vec::new(),
+          build: Vec::new(),
+        },
+        XRange::Val(minor) => NpmVersion {
+          major,
+          minor: minor + 1,
+          patch: 0,
+          pre: Vec::new(),
+          build: Vec::new(),
+        },
+      },
+    };
+    VersionRange {
+      start: self.as_lower_bound(),
+      end: RangeBound::exclusive(end),
+    }
+  }
+
+  pub fn as_caret_version_range(&self) -> VersionRange {
+    // partial ranges allow patch and minor updates, except when
+    // leading parts are < 1 in which case it will only bump the
+    // first non-zero or patch part
+    let end = match self.major {
+      XRange::Wildcard => return VersionRange::all(),
+      XRange::Val(major) => {
+        let next_major = NpmVersion {
+          major: major + 1,
+          ..Default::default()
+        };
+        if major > 0 {
+          next_major
+        } else {
+          match self.minor {
+            XRange::Wildcard => next_major,
+            XRange::Val(minor) => {
+              let next_minor = NpmVersion {
+                minor: minor + 1,
+                ..Default::default()
+              };
+              if minor > 0 {
+                next_minor
+              } else {
+                match self.patch {
+                  XRange::Wildcard => next_minor,
+                  XRange::Val(patch) => NpmVersion {
+                    patch: patch + 1,
+                    ..Default::default()
+                  },
+                }
+              }
+            }
+          }
+        }
+      }
+    };
+    VersionRange {
+      start: self.as_lower_bound(),
+      end: RangeBound::Version(VersionBound {
+        kind: VersionBoundKind::Exclusive,
+        version: end,
+      }),
+    }
+  }
+
+  pub fn as_lower_bound(&self) -> RangeBound {
+    RangeBound::inclusive(NpmVersion {
+      major: match self.major {
+        XRange::Val(val) => val,
+        XRange::Wildcard => 0,
+      },
+      minor: match self.minor {
+        XRange::Val(val) => val,
+        XRange::Wildcard => 0,
+      },
+      patch: match self.patch {
+        XRange::Val(val) => val,
+        XRange::Wildcard => 0,
+      },
+      pre: self.pre.clone(),
+      build: self.build.clone(),
+    })
+  }
+
+  pub fn as_upper_bound(&self) -> RangeBound {
+    let mut end = NpmVersion::default();
+    let mut kind = VersionBoundKind::Inclusive;
+    match self.patch {
+      XRange::Wildcard => {
+        end.minor += 1;
+        kind = VersionBoundKind::Exclusive;
+      }
+      XRange::Val(val) => {
+        end.patch = val;
+      }
+    }
+    match self.minor {
+      XRange::Wildcard => {
+        end.minor = 0;
+        end.major += 1;
+        kind = VersionBoundKind::Exclusive;
+      }
+      XRange::Val(val) => {
+        end.minor += val;
+      }
+    }
+    match self.major {
+      XRange::Wildcard => {
+        return RangeBound::Unbounded;
+      }
+      XRange::Val(val) => {
+        end.major += val;
+      }
+    }
+
+    if kind == VersionBoundKind::Inclusive {
+      end.pre = self.pre.clone();
+    }
+
+    RangeBound::version(kind, end)
+  }
+
+  pub fn as_equal_range(&self) -> VersionRange {
+    let major = match self.major {
+      XRange::Wildcard => {
+        return self.as_greater_range(VersionBoundKind::Inclusive)
+      }
+      XRange::Val(val) => val,
+    };
+    let minor = match self.minor {
+      XRange::Wildcard => {
+        return self.as_greater_range(VersionBoundKind::Inclusive)
+      }
+      XRange::Val(val) => val,
+    };
+    let patch = match self.patch {
+      XRange::Wildcard => {
+        return self.as_greater_range(VersionBoundKind::Inclusive)
+      }
+      XRange::Val(val) => val,
+    };
+    let version = NpmVersion {
+      major,
+      minor,
+      patch,
+      pre: self.pre.clone(),
+      build: self.build.clone(),
+    };
+    VersionRange {
+      start: RangeBound::inclusive(version.clone()),
+      end: RangeBound::inclusive(version),
+    }
+  }
+
+  pub fn as_greater_than(
+    &self,
+    mut start_kind: VersionBoundKind,
+  ) -> VersionRange {
+    let major = match self.major {
+      XRange::Wildcard => match start_kind {
+        VersionBoundKind::Inclusive => return VersionRange::all(),
+        VersionBoundKind::Exclusive => return VersionRange::none(),
+      },
+      XRange::Val(major) => major,
+    };
+    let mut start = NpmVersion::default();
+
+    if start_kind == VersionBoundKind::Inclusive {
+      start.pre = self.pre.clone();
+    }
+
+    start.major = major;
+    match self.minor {
+      XRange::Wildcard => {
+        if start_kind == VersionBoundKind::Exclusive {
+          start_kind = VersionBoundKind::Inclusive;
+          start.major += 1;
+        }
+      }
+      XRange::Val(minor) => {
+        start.minor = minor;
+      }
+    }
+    match self.patch {
+      XRange::Wildcard => {
+        if start_kind == VersionBoundKind::Exclusive {
+          start_kind = VersionBoundKind::Inclusive;
+          start.minor += 1;
+        }
+      }
+      XRange::Val(patch) => {
+        start.patch = patch;
+      }
+    }
+
+    VersionRange {
+      start: RangeBound::version(start_kind, start),
+      end: RangeBound::Unbounded,
+    }
+  }
+
+  pub fn as_less_than(&self, mut end_kind: VersionBoundKind) -> VersionRange {
+    let major = match self.major {
+      XRange::Wildcard => match end_kind {
+        VersionBoundKind::Inclusive => return VersionRange::all(),
+        VersionBoundKind::Exclusive => return VersionRange::none(),
+      },
+      XRange::Val(major) => major,
+    };
+    let mut end = NpmVersion {
+      major,
+      ..Default::default()
+    };
+    match self.minor {
+      XRange::Wildcard => {
+        if end_kind == VersionBoundKind::Inclusive {
+          end.major += 1;
+        }
+        end_kind = VersionBoundKind::Exclusive;
+      }
+      XRange::Val(minor) => {
+        end.minor = minor;
+      }
+    }
+    match self.patch {
+      XRange::Wildcard => {
+        if end_kind == VersionBoundKind::Inclusive {
+          end.minor += 1;
+        }
+        end_kind = VersionBoundKind::Exclusive;
+      }
+      XRange::Val(patch) => {
+        end.patch = patch;
+      }
+    }
+    if end_kind == VersionBoundKind::Inclusive {
+      end.pre = self.pre.clone();
+    }
+    VersionRange {
+      start: RangeBound::Unbounded,
+      end: RangeBound::version(end_kind, end),
+    }
+  }
+
+  pub fn as_greater_range(&self, start_kind: VersionBoundKind) -> VersionRange {
+    let major = match self.major {
+      XRange::Wildcard => return VersionRange::all(),
+      XRange::Val(major) => major,
+    };
+    let mut start = NpmVersion::default();
+    let mut end = NpmVersion::default();
+    start.major = major;
+    end.major = major;
+    match self.patch {
+      XRange::Wildcard => {
+        if self.minor != XRange::Wildcard {
+          end.minor += 1;
+        }
+      }
+      XRange::Val(patch) => {
+        start.patch = patch;
+        end.patch = patch;
+      }
+    }
+    match self.minor {
+      XRange::Wildcard => {
+        end.major += 1;
+      }
+      XRange::Val(minor) => {
+        start.minor = minor;
+        end.minor += minor;
+      }
+    }
+    let end_kind = if start_kind == VersionBoundKind::Inclusive && start == end
+    {
+      VersionBoundKind::Inclusive
+    } else {
+      VersionBoundKind::Exclusive
+    };
+    VersionRange {
+      start: RangeBound::version(start_kind, start),
+      end: RangeBound::version(end_kind, end),
+    }
+  }
+}
diff --git a/cli/npm/semver/specifier.rs b/cli/npm/semver/specifier.rs
new file mode 100644
index 000000000..019360422
--- /dev/null
+++ b/cli/npm/semver/specifier.rs
@@ -0,0 +1,250 @@
+// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
+
+use deno_core::anyhow::Context;
+use deno_core::error::AnyError;
+use monch::*;
+
+use super::errors::with_failure_handling;
+use super::range::Partial;
+use super::range::VersionBoundKind;
+use super::range::VersionRange;
+use super::range::XRange;
+use super::NpmVersion;
+
+/// Version requirement found in npm specifiers.
+#[derive(Clone, Debug, PartialEq, Eq, Hash)]
+pub struct SpecifierVersionReq {
+  raw_text: String,
+  range: VersionRange,
+}
+
+impl std::fmt::Display for SpecifierVersionReq {
+  fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+    write!(f, "{}", self.raw_text)
+  }
+}
+
+impl SpecifierVersionReq {
+  pub fn parse(text: &str) -> Result<Self, AnyError> {
+    with_failure_handling(parse_npm_specifier)(text).with_context(|| {
+      format!("Invalid npm specifier version requirement '{}'.", text)
+    })
+  }
+
+  pub fn matches(&self, version: &NpmVersion) -> bool {
+    self.range.satisfies(version)
+  }
+}
+
+fn parse_npm_specifier(input: &str) -> ParseResult<SpecifierVersionReq> {
+  map(version_range, |range| SpecifierVersionReq {
+    raw_text: input.to_string(),
+    range,
+  })(input)
+}
+
+// Note: Although the code below looks very similar to what's used for
+// parsing npm version requirements, the code here is more strict
+// in order to not allow for people to get ridiculous when using
+// npm specifiers.
+
+// version_range ::= partial | tilde | caret
+fn version_range(input: &str) -> ParseResult<VersionRange> {
+  or3(
+    map(preceded(ch('~'), partial), |partial| {
+      partial.as_tilde_version_range()
+    }),
+    map(preceded(ch('^'), partial), |partial| {
+      partial.as_caret_version_range()
+    }),
+    map(partial, |partial| {
+      partial.as_greater_range(VersionBoundKind::Inclusive)
+    }),
+  )(input)
+}
+
+// partial ::= xr ( '.' xr ( '.' xr qualifier ? )? )?
+fn partial(input: &str) -> ParseResult<Partial> {
+  let (input, major) = xr()(input)?;
+  let (input, maybe_minor) = maybe(preceded(ch('.'), xr()))(input)?;
+  let (input, maybe_patch) = if maybe_minor.is_some() {
+    maybe(preceded(ch('.'), xr()))(input)?
+  } else {
+    (input, None)
+  };
+  let (input, qual) = if maybe_patch.is_some() {
+    maybe(qualifier)(input)?
+  } else {
+    (input, None)
+  };
+  let qual = qual.unwrap_or_default();
+  Ok((
+    input,
+    Partial {
+      major,
+      minor: maybe_minor.unwrap_or(XRange::Wildcard),
+      patch: maybe_patch.unwrap_or(XRange::Wildcard),
+      pre: qual.pre,
+      build: qual.build,
+    },
+  ))
+}
+
+// xr ::= 'x' | 'X' | '*' | nr
+fn xr<'a>() -> impl Fn(&'a str) -> ParseResult<'a, XRange> {
+  or(
+    map(or3(tag("x"), tag("X"), tag("*")), |_| XRange::Wildcard),
+    map(nr, XRange::Val),
+  )
+}
+
+// nr ::= '0' | ['1'-'9'] ( ['0'-'9'] ) *
+fn nr(input: &str) -> ParseResult<u64> {
+  or(map(tag("0"), |_| 0), move |input| {
+    let (input, result) = if_not_empty(substring(pair(
+      if_true(next_char, |c| c.is_ascii_digit() && *c != '0'),
+      skip_while(|c| c.is_ascii_digit()),
+    )))(input)?;
+    let val = match result.parse::<u64>() {
+      Ok(val) => val,
+      Err(err) => {
+        return ParseError::fail(
+          input,
+          format!("Error parsing '{}' to u64.\n\n{:#}", result, err),
+        )
+      }
+    };
+    Ok((input, val))
+  })(input)
+}
+
+#[derive(Debug, Clone, Default)]
+struct Qualifier {
+  pre: Vec<String>,
+  build: Vec<String>,
+}
+
+// qualifier ::= ( '-' pre )? ( '+' build )?
+fn qualifier(input: &str) -> ParseResult<Qualifier> {
+  let (input, pre_parts) = maybe(pre)(input)?;
+  let (input, build_parts) = maybe(build)(input)?;
+  Ok((
+    input,
+    Qualifier {
+      pre: pre_parts.unwrap_or_default(),
+      build: build_parts.unwrap_or_default(),
+    },
+  ))
+}
+
+// pre ::= parts
+fn pre(input: &str) -> ParseResult<Vec<String>> {
+  preceded(ch('-'), parts)(input)
+}
+
+// build ::= parts
+fn build(input: &str) -> ParseResult<Vec<String>> {
+  preceded(ch('+'), parts)(input)
+}
+
+// parts ::= part ( '.' part ) *
+fn parts(input: &str) -> ParseResult<Vec<String>> {
+  if_not_empty(map(separated_list(part, ch('.')), |text| {
+    text.into_iter().map(ToOwned::to_owned).collect()
+  }))(input)
+}
+
+// part ::= nr | [-0-9A-Za-z]+
+fn part(input: &str) -> ParseResult<&str> {
+  // nr is in the other set, so don't bother checking for it
+  if_true(
+    take_while(|c| c.is_ascii_alphanumeric() || c == '-'),
+    |result| !result.is_empty(),
+  )(input)
+}
+
+#[cfg(test)]
+mod tests {
+  use super::*;
+
+  struct VersionReqTester(SpecifierVersionReq);
+
+  impl VersionReqTester {
+    fn new(text: &str) -> Self {
+      Self(SpecifierVersionReq::parse(text).unwrap())
+    }
+
+    fn matches(&self, version: &str) -> bool {
+      self.0.matches(&NpmVersion::parse(version).unwrap())
+    }
+  }
+
+  #[test]
+  fn version_req_exact() {
+    let tester = VersionReqTester::new("1.0.1");
+    assert!(!tester.matches("1.0.0"));
+    assert!(tester.matches("1.0.1"));
+    assert!(!tester.matches("1.0.2"));
+    assert!(!tester.matches("1.1.1"));
+  }
+
+  #[test]
+  fn version_req_minor() {
+    let tester = VersionReqTester::new("1.1");
+    assert!(!tester.matches("1.0.0"));
+    assert!(tester.matches("1.1.0"));
+    assert!(tester.matches("1.1.1"));
+    assert!(!tester.matches("1.2.0"));
+    assert!(!tester.matches("1.2.1"));
+  }
+
+  #[test]
+  fn version_req_caret() {
+    let tester = VersionReqTester::new("^1.1.1");
+    assert!(!tester.matches("1.1.0"));
+    assert!(tester.matches("1.1.1"));
+    assert!(tester.matches("1.1.2"));
+    assert!(tester.matches("1.2.0"));
+    assert!(!tester.matches("2.0.0"));
+
+    let tester = VersionReqTester::new("^0.1.1");
+    assert!(!tester.matches("0.0.0"));
+    assert!(!tester.matches("0.1.0"));
+    assert!(tester.matches("0.1.1"));
+    assert!(tester.matches("0.1.2"));
+    assert!(!tester.matches("0.2.0"));
+    assert!(!tester.matches("1.0.0"));
+
+    let tester = VersionReqTester::new("^0.0.1");
+    assert!(!tester.matches("0.0.0"));
+    assert!(tester.matches("0.0.1"));
+    assert!(!tester.matches("0.0.2"));
+    assert!(!tester.matches("0.1.0"));
+    assert!(!tester.matches("1.0.0"));
+  }
+
+  #[test]
+  fn version_req_tilde() {
+    let tester = VersionReqTester::new("~1.1.1");
+    assert!(!tester.matches("1.1.0"));
+    assert!(tester.matches("1.1.1"));
+    assert!(tester.matches("1.1.2"));
+    assert!(!tester.matches("1.2.0"));
+    assert!(!tester.matches("2.0.0"));
+
+    let tester = VersionReqTester::new("~0.1.1");
+    assert!(!tester.matches("0.0.0"));
+    assert!(!tester.matches("0.1.0"));
+    assert!(tester.matches("0.1.1"));
+    assert!(tester.matches("0.1.2"));
+    assert!(!tester.matches("0.2.0"));
+    assert!(!tester.matches("1.0.0"));
+
+    let tester = VersionReqTester::new("~0.0.1");
+    assert!(!tester.matches("0.0.0"));
+    assert!(tester.matches("0.0.1"));
+    assert!(tester.matches("0.0.2")); // for some reason this matches, but not with ^
+    assert!(!tester.matches("0.1.0"));
+    assert!(!tester.matches("1.0.0"));
+  }
+}
diff --git a/cli/npm/tarball.rs b/cli/npm/tarball.rs
index 33e4faa69..3971e0b07 100644
--- a/cli/npm/tarball.rs
+++ b/cli/npm/tarball.rs
@@ -158,12 +158,13 @@ fn extract_tarball(data: &[u8], output_folder: &Path) -> Result<(), AnyError> {
 #[cfg(test)]
 mod test {
   use super::*;
+  use crate::npm::semver::NpmVersion;
 
   #[test]
   pub fn test_verify_tarball() {
     let package_id = NpmPackageId {
       name: "package".to_string(),
-      version: semver::Version::parse("1.0.0").unwrap(),
+      version: NpmVersion::parse("1.0.0").unwrap(),
     };
     let actual_checksum =
       "z4phnx7vul3xvchq1m2ab9yg5aulvxxcg/spidns6c5h0ne8xyxysp+dgnkhfuwvy7kxvudbeoglodj6+sfapg==";
diff --git a/cli/npm/version_req.rs b/cli/npm/version_req.rs
deleted file mode 100644
index 24f3788ad..000000000
--- a/cli/npm/version_req.rs
+++ /dev/null
@@ -1,219 +0,0 @@
-// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
-
-use std::borrow::Cow;
-
-use deno_core::anyhow::bail;
-use deno_core::error::AnyError;
-use once_cell::sync::Lazy;
-use regex::Regex;
-
-use super::resolution::NpmVersionMatcher;
-
-static MINOR_SPECIFIER_RE: Lazy<Regex> =
-  Lazy::new(|| Regex::new(r#"^[0-9]+\.[0-9]+$"#).unwrap());
-
-/// Version requirement found in npm specifiers.
-#[derive(Clone, Debug, Default, PartialEq, Eq, Hash)]
-pub struct SpecifierVersionReq(semver::VersionReq);
-
-impl std::fmt::Display for SpecifierVersionReq {
-  fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-    write!(f, "{}", self.0)
-  }
-}
-
-impl SpecifierVersionReq {
-  // in order to keep using semver, we do some pre-processing to change the behavior
-  pub fn parse(text: &str) -> Result<Self, AnyError> {
-    // for now, we don't support these scenarios
-    if text.contains("||") {
-      bail!("not supported '||'");
-    }
-    if text.contains(',') {
-      bail!("not supported ','");
-    }
-    // force exact versions to be matched exactly
-    let text = if semver::Version::parse(text).is_ok() {
-      Cow::Owned(format!("={}", text))
-    } else {
-      Cow::Borrowed(text)
-    };
-    // force requirements like 1.2 to be ~1.2 instead of ^1.2
-    let text = if MINOR_SPECIFIER_RE.is_match(&text) {
-      Cow::Owned(format!("~{}", text))
-    } else {
-      text
-    };
-    Ok(Self(semver::VersionReq::parse(&text)?))
-  }
-
-  pub fn matches(&self, version: &semver::Version) -> bool {
-    self.0.matches(version)
-  }
-}
-
-/// A version requirement found in an npm package's dependencies.
-pub struct NpmVersionReq {
-  raw_text: String,
-  comparators: Vec<semver::VersionReq>,
-}
-
-impl NpmVersionReq {
-  pub fn parse(text: &str) -> Result<NpmVersionReq, AnyError> {
-    // semver::VersionReq doesn't support spaces between comparators
-    // and it doesn't support using || for "OR", so we pre-process
-    // the version requirement in order to make this work.
-    let raw_text = text.to_string();
-    let part_texts = text.split("||").collect::<Vec<_>>();
-    let mut comparators = Vec::with_capacity(part_texts.len());
-    for part in part_texts {
-      comparators.push(npm_version_req_parse_part(part)?);
-    }
-    Ok(NpmVersionReq {
-      raw_text,
-      comparators,
-    })
-  }
-}
-
-impl NpmVersionMatcher for NpmVersionReq {
-  fn matches(&self, version: &semver::Version) -> bool {
-    self.comparators.iter().any(|c| c.matches(version))
-  }
-
-  fn version_text(&self) -> String {
-    self.raw_text.to_string()
-  }
-}
-
-fn npm_version_req_parse_part(
-  text: &str,
-) -> Result<semver::VersionReq, AnyError> {
-  let text = text.trim();
-  let text = text.strip_prefix('v').unwrap_or(text);
-  // force exact versions to be matched exactly
-  let text = if semver::Version::parse(text).is_ok() {
-    Cow::Owned(format!("={}", text))
-  } else {
-    Cow::Borrowed(text)
-  };
-  // force requirements like 1.2 to be ~1.2 instead of ^1.2
-  let text = if MINOR_SPECIFIER_RE.is_match(&text) {
-    Cow::Owned(format!("~{}", text))
-  } else {
-    text
-  };
-  let mut chars = text.chars().enumerate().peekable();
-  let mut final_text = String::new();
-  while chars.peek().is_some() {
-    let (i, c) = chars.next().unwrap();
-    let is_greater_or_less_than = c == '<' || c == '>';
-    if is_greater_or_less_than || c == '=' {
-      if i > 0 {
-        final_text = final_text.trim().to_string();
-        // add a comma to make semver::VersionReq parse this
-        final_text.push(',');
-      }
-      final_text.push(c);
-      let next_char = chars.peek().map(|(_, c)| c);
-      if is_greater_or_less_than && matches!(next_char, Some('=')) {
-        let c = chars.next().unwrap().1; // skip
-        final_text.push(c);
-      }
-    } else {
-      final_text.push(c);
-    }
-  }
-  Ok(semver::VersionReq::parse(&final_text)?)
-}
-
-#[cfg(test)]
-mod tests {
-  use super::*;
-
-  struct VersionReqTester(SpecifierVersionReq);
-
-  impl VersionReqTester {
-    fn new(text: &str) -> Self {
-      Self(SpecifierVersionReq::parse(text).unwrap())
-    }
-
-    fn matches(&self, version: &str) -> bool {
-      self.0.matches(&semver::Version::parse(version).unwrap())
-    }
-  }
-
-  #[test]
-  fn version_req_exact() {
-    let tester = VersionReqTester::new("1.0.1");
-    assert!(!tester.matches("1.0.0"));
-    assert!(tester.matches("1.0.1"));
-    assert!(!tester.matches("1.0.2"));
-    assert!(!tester.matches("1.1.1"));
-  }
-
-  #[test]
-  fn version_req_minor() {
-    let tester = VersionReqTester::new("1.1");
-    assert!(!tester.matches("1.0.0"));
-    assert!(tester.matches("1.1.0"));
-    assert!(tester.matches("1.1.1"));
-    assert!(!tester.matches("1.2.0"));
-    assert!(!tester.matches("1.2.1"));
-  }
-
-  struct NpmVersionReqTester(NpmVersionReq);
-
-  impl NpmVersionReqTester {
-    fn new(text: &str) -> Self {
-      Self(NpmVersionReq::parse(text).unwrap())
-    }
-
-    fn matches(&self, version: &str) -> bool {
-      self.0.matches(&semver::Version::parse(version).unwrap())
-    }
-  }
-
-  #[test]
-  pub fn npm_version_req_with_v() {
-    assert!(NpmVersionReq::parse("v1.0.0").is_ok());
-  }
-
-  #[test]
-  pub fn npm_version_req_exact() {
-    let tester = NpmVersionReqTester::new("2.1.2");
-    assert!(!tester.matches("2.1.1"));
-    assert!(tester.matches("2.1.2"));
-    assert!(!tester.matches("2.1.3"));
-
-    let tester = NpmVersionReqTester::new("2.1.2 || 2.1.5");
-    assert!(!tester.matches("2.1.1"));
-    assert!(tester.matches("2.1.2"));
-    assert!(!tester.matches("2.1.3"));
-    assert!(!tester.matches("2.1.4"));
-    assert!(tester.matches("2.1.5"));
-    assert!(!tester.matches("2.1.6"));
-  }
-
-  #[test]
-  pub fn npm_version_req_minor() {
-    let tester = NpmVersionReqTester::new("1.1");
-    assert!(!tester.matches("1.0.0"));
-    assert!(tester.matches("1.1.0"));
-    assert!(tester.matches("1.1.1"));
-    assert!(!tester.matches("1.2.0"));
-    assert!(!tester.matches("1.2.1"));
-  }
-
-  #[test]
-  pub fn npm_version_req_ranges() {
-    let tester = NpmVersionReqTester::new(">= 2.1.2 < 3.0.0 || 5.x");
-    assert!(!tester.matches("2.1.1"));
-    assert!(tester.matches("2.1.2"));
-    assert!(tester.matches("2.9.9"));
-    assert!(!tester.matches("3.0.0"));
-    assert!(tester.matches("5.0.0"));
-    assert!(tester.matches("5.1.0"));
-    assert!(!tester.matches("6.1.0"));
-  }
-}
diff --git a/cli/tests/testdata/npm/deno_run_non_existent.out b/cli/tests/testdata/npm/deno_run_non_existent.out
index 6d406d8f9..4f5d7b4c1 100644
--- a/cli/tests/testdata/npm/deno_run_non_existent.out
+++ b/cli/tests/testdata/npm/deno_run_non_existent.out
@@ -1,2 +1,2 @@
 Download http://localhost:4545/npm/registry/mkdirp
-error: Could not find npm package 'mkdirp' matching =0.5.125. Try retreiving the latest npm package information by running with --reload
+error: Could not find npm package 'mkdirp' matching 0.5.125. Try retreiving the latest npm package information by running with --reload