fix(cli): fix handling of non-normalized specifier (#9357)

cli/tests/compiler_api_test.ts

@@ -305,3 +305,17 @@ Deno.test({
     });
   },
 });
+
+Deno.test({
+  name: "Deno.emit() - non-normalized specifier and source can compile",
+  async fn() {
+    const specifier = "https://example.com/foo//bar.ts";
+    const { files } = await Deno.emit(specifier, {
+      sources: {
+        [specifier]: `export let foo: string = "foo";`,
+      },
+    });
+    assertEquals(files[`${specifier}.js`], 'export let foo = "foo";\n');
+    assert(typeof files[`${specifier}.js.map`] === "string");
+  },
+});

cli/tsc/99_main_compiler.js

@@ -19,6 +19,14 @@ delete Object.prototype.__proto__;
   let logDebug = false;
   let logSource = "JS";
 
+  // The map from the normalized specifier to the original.
+  // TypeScript normalizes the specifier in its internal processing,
+  // but the original specifier is needed when looking up the source from the runtime.
+  // This map stores that relationship, and the original can be restored by the
+  // normalized specifier.
+  // See: https://github.com/denoland/deno/issues/9277#issuecomment-769653834
+  const normalizedToOriginalMap = new Map();
+
   function setLogDebug(debug, source) {
     logDebug = debug;
     if (source) {
@@ -260,6 +268,9 @@ delete Object.prototype.__proto__;
         return sourceFile;
       }
 
+      // Needs the original specifier
+      specifier = normalizedToOriginalMap.get(specifier) ?? specifier;
+
       /** @type {{ data: string; hash?: string; scriptKind: ts.ScriptKind }} */
       const { data, hash, scriptKind } = core.jsonOpSync(
         "op_load",
@@ -436,6 +447,27 @@ delete Object.prototype.__proto__;
    * @property {string[]} rootNames
    */
 
+  /**
+   * Checks the normalized version of the root name and stores it in
+   * `normalizedToOriginalMap`. If the normalized specifier is already
+   * registered for the different root name, it throws an AssertionError.
+   *
+   * @param {string} rootName
+   */
+  function checkNormalizedPath(rootName) {
+    const normalized = ts.normalizePath(rootName);
+    const originalRootName = normalizedToOriginalMap.get(normalized);
+    if (typeof originalRootName === "undefined") {
+      normalizedToOriginalMap.set(normalized, rootName);
+    } else if (originalRootName !== rootName) {
+      // The different root names are normalizd to the same path.
+      // This will cause problem when looking up the source for each.
+      throw new AssertionError(
+        `The different names for the same normalized specifier are specified: normalized=${normalized}, rootNames=${originalRootName},${rootName}`,
+      );
+    }
+  }
+
   /** The API that is called by Rust when executing a request.
    * @param {Request} request
    */
@@ -445,6 +477,8 @@ delete Object.prototype.__proto__;
     debug(">>> exec start", { rootNames });
     debug(config);
 
+    rootNames.forEach(checkNormalizedPath);
+
     const { options, errors: configFileParsingDiagnostics } = ts
       .convertCompilerOptionsFromJson(config, "");
     // The `allowNonTsExtensions` is a "hidden" compiler option used in VSCode