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-## Runtime compiler APIs
-
-> ⚠️ The runtime compiler API is unstable (and requires the `--unstable` flag to
-> be used to enable it).
-
-The runtime compiler API allows access to the internals of Deno to be able to
-type check, transpile and bundle JavaScript and TypeScript. As of Deno 1.7,
-several disparate APIs we consolidated into a single API, `Deno.emit()`.
-
-### Deno.emit()
-
-The API is defined in the `Deno` namespace as:
-
-```ts
-function emit(
-  rootSpecifier: string | URL,
-  options?: EmitOptions,
-): Promise<EmitResult>;
-```
-
-The emit options are defined in the `Deno` namespace as:
-
-```ts
-interface EmitOptions {
-  /** Indicate that the source code should be emitted to a single file
-    * JavaScript bundle that is a single ES module (`"module"`) or a single
-    * file self contained script we executes in an immediately invoked function
-    * when loaded (`"classic"`). */
-  bundle?: "module" | "classic";
-  /** If `true` then the sources will be typed checked, returning any
-    * diagnostic errors in the result.  If `false` type checking will be
-    * skipped.  Defaults to `true`.
-    *
-    * *Note* by default, only TypeScript will be type checked, just like on
-    * the command line.  Use the `compilerOptions` options of `checkJs` to
-    * enable type checking of JavaScript. */
-  check?: boolean;
-  /** A set of options that are aligned to TypeScript compiler options that
-    * are supported by Deno. */
-  compilerOptions?: CompilerOptions;
-  /** An [import-map](https://deno.land/manual/linking_to_external_code/import_maps#import-maps)
-    * which will be applied to the imports. */
-  importMap?: ImportMap;
-  /** An absolute path to an [import-map](https://deno.land/manual/linking_to_external_code/import_maps#import-maps).
-    * Required to be specified if an `importMap` is specified to be able to
-    * determine resolution of relative paths. If a `importMap` is not
-    * specified, then it will assumed the file path points to an import map on
-    * disk and will be attempted to be loaded based on current runtime
-    * permissions.
-    */
-  importMapPath?: string;
-  /** A record of sources to use when doing the emit.  If provided, Deno will
-    * use these sources instead of trying to resolve the modules externally. */
-  sources?: Record<string, string>;
-}
-```
-
-The emit result is defined in the `Deno` namespace as:
-
-```ts
-interface EmitResult {
-  /** Diagnostic messages returned from the type checker (`tsc`). */
-  diagnostics: Diagnostic[];
-  /** Any emitted files.  If bundled, then the JavaScript will have the
-   * key of `deno:///bundle.js` with an optional map (based on
-   * `compilerOptions`) in `deno:///bundle.js.map`. */
-  files: Record<string, string>;
-  /** An optional array of any compiler options that were ignored by Deno. */
-  ignoredOptions?: string[];
-  /** An array of internal statistics related to the emit, for diagnostic
-   * purposes. */
-  stats: Array<[string, number]>;
-}
-```
-
-The API is designed to support several use cases, which are described in the
-sections below.
-
-### Using external sources
-
-Using external sources, both local and remote, `Deno.emit()` can behave like
-`deno cache` does on the command line, resolving those external dependencies,
-type checking those dependencies, and providing an emitted output.
-
-By default, `Deno.emit()` will utilise external resources. The _rootSpecifier_
-supplied as the first argument will determine what module will be used as the
-root. The root module is similar to what you would provide on the command line.
-
-For example if you did:
-
-```
-> deno run mod.ts
-```
-
-You could do something similar with `Deno.emit()`:
-
-```ts
-try {
-  const { files } = await Deno.emit("mod.ts");
-  for (const [fileName, text] of Object.entries(files)) {
-    console.log(`emitted ${fileName} with a length of ${text.length}`);
-  }
-} catch (e) {
-  // something went wrong, inspect `e` to determine
-}
-```
-
-`Deno.emit()` will use the same on disk cache for remote modules that the
-standard CLI does, and it inherits the permissions and cache options of the
-process that executes it.
-
-If the _rootSpecifier_ is a relative path, then the current working directory of
-the Deno process will be used to resolve the specifier. (Not relative to the
-current module!)
-
-The _rootSpecifier_ can be a string file path, a string URL, or a URL.
-`Deno.emit()` supports the same protocols for URLs that Deno supports, which are
-currently `file`, `http`, `https`, and `data`.
-
-### Providing sources
-
-Instead of resolving modules externally, you can provide `Deno.emit()` with the
-sources directly. This is especially useful for a server to be able to provide
-_on demand_ compiling of code supplied by a user, where the Deno process has
-collected all the code it wants to emit.
-
-The sources are passed in the _sources_ property of the `Deno.emit()` _options_
-argument:
-
-```ts
-const { files } = await Deno.emit("/mod.ts", {
-  sources: {
-    "/mod.ts": `import * as a from "./a.ts";\nconsole.log(a);\n`,
-    "/a.ts": `export const a: Record<string, string> = {};\n`,
-  },
-});
-```
-
-When sources are provided, Deno will no longer look externally and will try to
-resolve all modules from within the map of sources provided, though the module
-resolution follow the same rules as if the modules were external. For example
-all module specifiers need their full filename. Also, because there are no media
-types, if you are providing remote URLs in the sources, the path should end with
-the appropriate extension, so that Deno can determine how to handle the file.
-
-### Type checking and emitting
-
-By default, `Deno.emit()` will type check any TypeScript (and TSX) it
-encounters, just like on the command line. It will also attempt to transpile
-JSX, but will leave JavaScript "alone". This behavior can be changed by changing
-the compiler options. For example if you wanted Deno to type check your
-JavaScript as well, you could set the _checkJs_ option to `true` in the compiler
-options:
-
-```ts
-const { files, diagnostics } = await Deno.emit("./mod.js", {
-  compilerOptions: {
-    checkJs: true,
-  },
-});
-```
-
-The `Deno.emit()` result provides any diagnostic messages about the code
-supplied. On the command line, any diagnostic messages get logged to stderr and
-the Deno process terminates, but with `Deno.emit()` they are returned to the
-caller.
-
-Typically you will want to check if there are any diagnostics and handle them
-appropriately. You can introspect the diagnostics individually, but there is a
-handy formatting function available to make it easier to potentially log the
-diagnostics to the console for the user called `Deno.formatDiagnostics()`:
-
-```ts
-const { files, diagnostics } = await Deno.emit("./mod.ts");
-if (diagnostics.length) {
-  // there is something that impacted the emit
-  console.warn(Deno.formatDiagnostics(diagnostics));
-}
-```
-
-### Bundling
-
-`Deno.emit()` is also capable of providing output similar to `deno bundle` on
-the command line. This is enabled by setting the _bundle_ option to `"module"`
-or `"classic"`. Currently Deno supports bundling as a single file ES module
-(`"module"`) or a single file self contained legacy script (`"classic"`).
-
-```ts
-const { files, diagnostics } = await Deno.emit("./mod.ts", {
-  bundle: "module",
-});
-```
-
-The _files_ of the result will contain a single key named `deno:///bundle.js` of
-which the value with be the resulting bundle.
-
-> ⚠️ Just like with `deno bundle`, the bundle will not include things like
-> dynamic imports or worker scripts, and those would be expected to be resolved
-> and available when the code is run.
-
-### Import maps
-
-`Deno.emit()` supports import maps as well, just like on the command line. This
-is a really powerful feature that can be used even more effectively to emit and
-bundle code.
-
-Because of the way import maps work, when using with `Deno.emit()` you also have
-to supply an absolute URL for the import map. This allows Deno to resolve any
-relative URLs specified in the import map. This needs to be supplied even if the
-import map doesn't contain any relative URLs. The URL does not need to really
-exist, it is just feed to the API.
-
-An example might be that I want to use a bare specifier to load a special
-version of _lodash_ I am using with my project. I could do the following:
-
-```ts
-const { files } = await Deno.emit("mod.ts", {
-  bundle: "module",
-  importMap: {
-    imports: {
-      "lodash": "https://deno.land/x/lodash",
-    },
-  },
-  importMapPath: "file:///import-map.json",
-});
-```
-
-> ⚠️ If you are not bundling your code, the emitted code specifiers do not get
-> rewritten, that means that whatever process will consume the code, Deno or a
-> browser for example, would need to support import maps and have that map
-> available at runtime.
-
-### Skip type checking/transpiling only
-
-`Deno.emit()` supports skipping type checking similar to the `--no-check` flag
-on the command line. This is accomplished by setting the _check_ property to
-`false`:
-
-```ts
-const { files } = await Deno.emit("./mod.ts", {
-  check: false,
-});
-```
-
-Setting _check_ to `false` will instruct Deno to not utilise the TypeScript
-compiler to type check the code and emit it, instead only transpiling the code
-from within Deno. This can be significantly quicker than doing the full type
-checking.
-
-### Compiler options
-
-`Deno.emit()` supports quite a few compiler options that can impact how code is
-type checked and emitted. They are similar to the options supported by a
-`tsconfig.json` in the `compilerOptions` section, but there are several options
-that are not supported. This is because they are either meaningless in Deno or
-would cause Deno to not be able to work properly. The defaults for `Deno.emit()`
-are the same defaults that are on the command line. The options are
-[documented here](https://doc.deno.land/builtin/unstable#Deno.CompilerOptions)
-along with their default values and are built into the Deno types.
-
-If you are type checking your code, the compiler options will be type checked
-for you, but if for some reason you are either dynamically providing the
-compiler options or are not type checking, then the result of `Deno.emit()` will
-provide you with an array of _ignoredOptions_ if there are any.
-
-> ⚠️ we have only tried to disable/remove options that we know won't work, that
-> does not mean we extensively test all options in all configurations under
-> `Deno.emit()`. You may find that some behaviors do not match what you can get
-> from `tsc` or are otherwise incompatible. If you do find something that
-> doesn't work, please do feel free to raise an issue.