1 files changed, 329 insertions, 0 deletions
diff --git a/cli/js/compiler/host.ts b/cli/js/compiler/host.ts
new file mode 100644
index 000000000..8032d83b3
--- /dev/null
+++ b/cli/js/compiler/host.ts
@@ -0,0 +1,329 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+
+import { ASSETS, MediaType, SourceFile } from "./sourcefile.ts";
+import { OUT_DIR, WriteFileCallback, getAsset } from "./util.ts";
+import { cwd } from "../ops/fs/dir.ts";
+import { assert, notImplemented } from "../util.ts";
+import * as util from "../util.ts";
+
+/** Specifies the target that the host should use to inform the TypeScript
+ * compiler of what types should be used to validate the program against. */
+export enum CompilerHostTarget {
+  /** The main isolate library, where the main program runs. */
+  Main = "main",
+  /** The runtime API library. */
+  Runtime = "runtime",
+  /** The worker isolate library, where worker programs run. */
+  Worker = "worker"
+}
+
+export interface CompilerHostOptions {
+  /** Flag determines if the host should assume a single bundle output. */
+  bundle?: boolean;
+
+  /** Determines what the default library that should be used when type checking
+   * TS code. */
+  target: CompilerHostTarget;
+
+  /** A function to be used when the program emit occurs to write out files. */
+  writeFile: WriteFileCallback;
+}
+
+export interface ConfigureResponse {
+  ignoredOptions?: string[];
+  diagnostics?: ts.Diagnostic[];
+}
+
+/** Options that need to be used when generating a bundle (either trusted or
+ * runtime). */
+export const defaultBundlerOptions: ts.CompilerOptions = {
+  allowJs: true,
+  inlineSourceMap: false,
+  module: ts.ModuleKind.System,
+  outDir: undefined,
+  outFile: `${OUT_DIR}/bundle.js`,
+  // disabled until we have effective way to modify source maps
+  sourceMap: false
+};
+
+/** Default options used by the compiler Host when compiling. */
+export const defaultCompileOptions: ts.CompilerOptions = {
+  allowJs: false,
+  allowNonTsExtensions: true,
+  checkJs: false,
+  esModuleInterop: true,
+  jsx: ts.JsxEmit.React,
+  module: ts.ModuleKind.ESNext,
+  outDir: OUT_DIR,
+  resolveJsonModule: true,
+  sourceMap: true,
+  strict: true,
+  stripComments: true,
+  target: ts.ScriptTarget.ESNext
+};
+
+/** Options that need to be used when doing a runtime (non bundled) compilation */
+export const defaultRuntimeCompileOptions: ts.CompilerOptions = {
+  outDir: undefined
+};
+
+/** Default options used when doing a transpile only. */
+export const defaultTranspileOptions: ts.CompilerOptions = {
+  esModuleInterop: true,
+  module: ts.ModuleKind.ESNext,
+  sourceMap: true,
+  scriptComments: true,
+  target: ts.ScriptTarget.ESNext
+};
+
+/** Options that either do nothing in Deno, or would cause undesired behavior
+ * if modified. */
+const ignoredCompilerOptions: readonly string[] = [
+  "allowSyntheticDefaultImports",
+  "baseUrl",
+  "build",
+  "composite",
+  "declaration",
+  "declarationDir",
+  "declarationMap",
+  "diagnostics",
+  "downlevelIteration",
+  "emitBOM",
+  "emitDeclarationOnly",
+  "esModuleInterop",
+  "extendedDiagnostics",
+  "forceConsistentCasingInFileNames",
+  "help",
+  "importHelpers",
+  "incremental",
+  "inlineSourceMap",
+  "inlineSources",
+  "init",
+  "isolatedModules",
+  "listEmittedFiles",
+  "listFiles",
+  "mapRoot",
+  "maxNodeModuleJsDepth",
+  "module",
+  "moduleResolution",
+  "newLine",
+  "noEmit",
+  "noEmitHelpers",
+  "noEmitOnError",
+  "noLib",
+  "noResolve",
+  "out",
+  "outDir",
+  "outFile",
+  "paths",
+  "preserveSymlinks",
+  "preserveWatchOutput",
+  "pretty",
+  "rootDir",
+  "rootDirs",
+  "showConfig",
+  "skipDefaultLibCheck",
+  "skipLibCheck",
+  "sourceMap",
+  "sourceRoot",
+  "stripInternal",
+  "target",
+  "traceResolution",
+  "tsBuildInfoFile",
+  "types",
+  "typeRoots",
+  "version",
+  "watch"
+];
+
+export class Host implements ts.CompilerHost {
+  private readonly _options = defaultCompileOptions;
+
+  private _target: CompilerHostTarget;
+
+  private _writeFile: WriteFileCallback;
+
+  private _getAsset(filename: string): SourceFile {
+    const lastSegment = filename.split("/").pop()!;
+    const url = ts.libMap.has(lastSegment)
+      ? ts.libMap.get(lastSegment)!
+      : lastSegment;
+    const sourceFile = SourceFile.get(url);
+    if (sourceFile) {
+      return sourceFile;
+    }
+    const name = url.includes(".") ? url : `${url}.d.ts`;
+    const sourceCode = getAsset(name);
+    return new SourceFile({
+      url,
+      filename: `${ASSETS}/${name}`,
+      mediaType: MediaType.TypeScript,
+      sourceCode
+    });
+  }
+
+  /* Deno specific APIs */
+
+  /** Provides the `ts.HostCompiler` interface for Deno. */
+  constructor({ bundle = false, target, writeFile }: CompilerHostOptions) {
+    this._target = target;
+    this._writeFile = writeFile;
+    if (bundle) {
+      // options we need to change when we are generating a bundle
+      Object.assign(this._options, defaultBundlerOptions);
+    }
+  }
+
+  /** Take a configuration string, parse it, and use it to merge with the
+   * compiler's configuration options.  The method returns an array of compiler
+   * options which were ignored, or `undefined`. */
+  configure(path: string, configurationText: string): ConfigureResponse {
+    util.log("compiler::host.configure", path);
+    assert(configurationText);
+    const { config, error } = ts.parseConfigFileTextToJson(
+      path,
+      configurationText
+    );
+    if (error) {
+      return { diagnostics: [error] };
+    }
+    const { options, errors } = ts.convertCompilerOptionsFromJson(
+      config.compilerOptions,
+      cwd()
+    );
+    const ignoredOptions: string[] = [];
+    for (const key of Object.keys(options)) {
+      if (
+        ignoredCompilerOptions.includes(key) &&
+        (!(key in this._options) || options[key] !== this._options[key])
+      ) {
+        ignoredOptions.push(key);
+        delete options[key];
+      }
+    }
+    Object.assign(this._options, options);
+    return {
+      ignoredOptions: ignoredOptions.length ? ignoredOptions : undefined,
+      diagnostics: errors.length ? errors : undefined
+    };
+  }
+
+  /** Merge options into the host's current set of compiler options and return
+   * the merged set. */
+  mergeOptions(...options: ts.CompilerOptions[]): ts.CompilerOptions {
+    Object.assign(this._options, ...options);
+    return Object.assign({}, this._options);
+  }
+
+  /* TypeScript CompilerHost APIs */
+
+  fileExists(_fileName: string): boolean {
+    return notImplemented();
+  }
+
+  getCanonicalFileName(fileName: string): string {
+    return fileName;
+  }
+
+  getCompilationSettings(): ts.CompilerOptions {
+    util.log("compiler::host.getCompilationSettings()");
+    return this._options;
+  }
+
+  getCurrentDirectory(): string {
+    return "";
+  }
+
+  getDefaultLibFileName(_options: ts.CompilerOptions): string {
+    util.log("compiler::host.getDefaultLibFileName()");
+    switch (this._target) {
+      case CompilerHostTarget.Main:
+      case CompilerHostTarget.Runtime:
+        return `${ASSETS}/lib.deno.window.d.ts`;
+      case CompilerHostTarget.Worker:
+        return `${ASSETS}/lib.deno.worker.d.ts`;
+    }
+  }
+
+  getNewLine(): string {
+    return "\n";
+  }
+
+  getSourceFile(
+    fileName: string,
+    languageVersion: ts.ScriptTarget,
+    onError?: (message: string) => void,
+    shouldCreateNewSourceFile?: boolean
+  ): ts.SourceFile | undefined {
+    util.log("compiler::host.getSourceFile", fileName);
+    try {
+      assert(!shouldCreateNewSourceFile);
+      const sourceFile = fileName.startsWith(ASSETS)
+        ? this._getAsset(fileName)
+        : SourceFile.get(fileName);
+      assert(sourceFile != null);
+      if (!sourceFile.tsSourceFile) {
+        assert(sourceFile.sourceCode != null);
+        sourceFile.tsSourceFile = ts.createSourceFile(
+          fileName.startsWith(ASSETS) ? sourceFile.filename : fileName,
+          sourceFile.sourceCode,
+          languageVersion
+        );
+        delete sourceFile.sourceCode;
+      }
+      return sourceFile.tsSourceFile;
+    } catch (e) {
+      if (onError) {
+        onError(String(e));
+      } else {
+        throw e;
+      }
+      return undefined;
+    }
+  }
+
+  readFile(_fileName: string): string | undefined {
+    return notImplemented();
+  }
+
+  resolveModuleNames(
+    moduleNames: string[],
+    containingFile: string
+  ): Array<ts.ResolvedModuleFull | undefined> {
+    util.log("compiler::host.resolveModuleNames", {
+      moduleNames,
+      containingFile
+    });
+    return moduleNames.map(specifier => {
+      const url = SourceFile.getUrl(specifier, containingFile);
+      const sourceFile = specifier.startsWith(ASSETS)
+        ? this._getAsset(specifier)
+        : url
+        ? SourceFile.get(url)
+        : undefined;
+      if (!sourceFile) {
+        return undefined;
+      }
+      return {
+        resolvedFileName: sourceFile.url,
+        isExternalLibraryImport: specifier.startsWith(ASSETS),
+        extension: sourceFile.extension
+      };
+    });
+  }
+
+  useCaseSensitiveFileNames(): boolean {
+    return true;
+  }
+
+  writeFile(
+    fileName: string,
+    data: string,
+    _writeByteOrderMark: boolean,
+    _onError?: (message: string) => void,
+    sourceFiles?: readonly ts.SourceFile[]
+  ): void {
+    util.log("compiler::host.writeFile", fileName);
+    this._writeFile(fileName, data, sourceFiles);
+  }
+}