feat

packages/babel-generator/src/buffer.ts

@@ -8,13 +8,12 @@ export type Pos = {
 export type Loc = {
   start?: Pos;
   end?: Pos;
-  identifierName?: string;
   filename?: string;
 };
 type SourcePos = {
-  identifierName: string | undefined;
   line: number | undefined;
   column: number | undefined;
+  identifierName: string | undefined;
   filename: string | undefined;
 };
 
@@ -23,7 +22,7 @@ type QueueItem = {
   repeat: number;
   line: number | undefined;
   column: number | undefined;
-  identifierName: string | undefined;
+  identifierName: undefined; // Not used, it always undefined.
   filename: string | undefined;
 };
 
@@ -73,7 +72,6 @@ export default class Buffer {
     repeat: number,
     line: number | undefined,
     column: number | undefined,
-    identifierName: string | undefined,
     filename: string | undefined,
   ) {
     const cursor = this._queueCursor;
@@ -85,7 +83,6 @@ export default class Buffer {
     item.repeat = repeat;
     item.line = line;
     item.column = column;
-    item.identifierName = identifierName;
     item.filename = filename;
 
     this._queueCursor++;
@@ -173,7 +170,6 @@ export default class Buffer {
       1,
       sourcePosition.line,
       sourcePosition.column,
-      sourcePosition.identifierName,
       sourcePosition.filename,
     );
   }
@@ -182,7 +178,7 @@ export default class Buffer {
    * Same as queue, but this indentation will never have a sourcmap marker.
    */
   queueIndentation(char: number, repeat: number): void {
-    this._pushQueue(char, repeat, undefined, undefined, undefined, undefined);
+    this._pushQueue(char, repeat, undefined, undefined, undefined);
   }
 
   _flush(): void {
@@ -408,8 +404,6 @@ export default class Buffer {
     const pos = loc[prop];
     const target = this._sourcePosition;
 
-    target.identifierName =
-      (prop === "start" && loc.identifierName) || undefined;
     if (pos) {
       target.line = pos.line + lineOffset;
       target.column = pos.column + columnOffset;

packages/babel-generator/src/generators/methods.ts

@@ -5,9 +5,18 @@ import type * as t from "@babel/types";
 export function _params(
   this: Printer,
   node: t.Function | t.TSDeclareMethod | t.TSDeclareFunction,
+  id: t.Expression | t.PrivateName,
 ) {
   this.print(node.typeParameters, node);
-  this.token("(");
+  if (isIdentifier(id)) {
+    // @ts-expect-error Undocumented property identifierName
+    this.withIdentifierName(id.loc?.identifierName || id.name, () => {
+      this.token("(");
+    });
+  } else {
+    this.token("(");
+  }
+
   this._parameters(node.params, node);
   this.token(")");
 
@@ -104,7 +113,7 @@ export function _methodHead(this: Printer, node: t.Method | t.TSDeclareMethod) {
     this.token("?");
   }
 
-  this._params(node);
+  this._params(node, key);
 }
 
 export function _predicate(
@@ -140,7 +149,7 @@ export function _functionHead(
     this.print(node.id, node);
   }
 
-  this._params(node);
+  this._params(node, node.id);
   if (node.type !== "TSDeclareFunction") {
     this._predicate(node);
   }
@@ -178,7 +187,7 @@ export function ArrowFunctionExpression(
   ) {
     this.print(firstParam, node);
   } else {
-    this._params(node);
+    this._params(node, undefined);
   }
 
   this._predicate(node);

packages/babel-generator/src/generators/types.ts

@@ -4,7 +4,13 @@ import type * as t from "@babel/types";
 import jsesc from "jsesc";
 
 export function Identifier(this: Printer, node: t.Identifier) {
-  this.word(node.name);
+  this.withIdentifierName(
+    // @ts-expect-error Undocumented property identifierName
+    node.loc?.identifierName || node.name,
+    () => {
+      this.word(node.name);
+    },
+  );
 }
 
 export function ArgumentPlaceholder(this: Printer) {

packages/babel-generator/src/printer.ts

@@ -323,6 +323,13 @@ class Printer {
     this._buf.withSource(prop, loc, cb);
   }
 
+  withIdentifierName(identifierName: string, cb: () => void): void {
+    const pos = this._buf._sourcePosition;
+    pos.identifierName = identifierName;
+    cb();
+    pos.identifierName = undefined;
+  }
+
   _space(): void {
     this._queue(charCodes.space);
   }

packages/babel-generator/test/fixtures/sourcemaps/call-identifiers/output.js

@@ -13,4 +13,4 @@ obj.foo().bar;
   obj.foo();
   obj.foo.bar;
   obj.foo().bar;
-}
+}

packages/babel-generator/test/fixtures/sourcemaps/real-world-babel-file1/source-map.json

@@ -74,5 +74,5 @@
   "sourcesContent": [
     "// From packages\\babel-cli\\src\\babel\\watcher.ts\n\nimport { createRequire } from \"module\";\nimport path from \"path\";\nimport type { WatchOptions, FSWatcher } from \"chokidar\";\n\nconst fileToDeps = new Map<string, Set<string>>();\nconst depToFiles = new Map<string, Set<string>>();\n\nlet isWatchMode = false;\nlet watcher: FSWatcher;\nconst watchQueue = new Set<string>();\nlet hasStarted = false;\n\nexport function enable({ enableGlobbing }: { enableGlobbing: boolean }) {\n  isWatchMode = true;\n\n  const { FSWatcher } = requireChokidar();\n\n  const options: WatchOptions = {\n    disableGlobbing: !enableGlobbing,\n    persistent: true,\n    ignoreInitial: true,\n    awaitWriteFinish: {\n      stabilityThreshold: 50,\n      pollInterval: 10,\n    },\n  };\n  watcher = new FSWatcher(options);\n\n  watcher.on(\"unlink\", unwatchFile);\n}\n\nexport function startWatcher() {\n  hasStarted = true;\n\n  for (const dep of watchQueue) {\n    watcher.add(dep);\n  }\n  watchQueue.clear();\n\n  watcher.on(\"ready\", () => {\n    console.log(\"The watcher is ready.\");\n  });\n}\n\nexport function watch(filename: string): void {\n  if (!isWatchMode) {\n    throw new Error(\n      \"Internal Babel error: .watch called when not in watch mode.\",\n    );\n  }\n\n  if (!hasStarted) {\n    watchQueue.add(path.resolve(filename));\n  } else {\n    watcher.add(path.resolve(filename));\n  }\n}\n\n/**\n * Call @param callback whenever a dependency (source file)/\n * external dependency (non-source file) changes.\n *\n * Handles mapping external dependencies to their corresponding\n * dependencies.\n */\nexport function onFilesChange(\n  callback: (filenames: string[], event: string, cause: string) => void,\n): void {\n  if (!isWatchMode) {\n    throw new Error(\n      \"Internal Babel error: .onFilesChange called when not in watch mode.\",\n    );\n  }\n\n  watcher.on(\"all\", (event, filename) => {\n    if (event !== \"change\" && event !== \"add\") return;\n\n    const absoluteFile = path.resolve(filename);\n    callback(\n      [absoluteFile, ...(depToFiles.get(absoluteFile) ?? [])],\n      event,\n      absoluteFile,\n    );\n  });\n}\n\nexport function updateExternalDependencies(\n  filename: string,\n  dependencies: Set<string>,\n) {\n  if (!isWatchMode) return;\n\n  // Use absolute paths\n  const absFilename = path.resolve(filename);\n  const absDependencies = new Set(\n    Array.from(dependencies, dep => path.resolve(dep)),\n  );\n\n  const deps = fileToDeps.get(absFilename);\n  if (deps) {\n    for (const dep of deps) {\n      if (!absDependencies.has(dep)) {\n        removeFileDependency(absFilename, dep);\n      }\n    }\n  }\n  for (const dep of absDependencies) {\n    let deps = depToFiles.get(dep);\n    if (!deps) {\n      depToFiles.set(dep, (deps = new Set()));\n\n      if (!hasStarted) {\n        watchQueue.add(dep);\n      } else {\n        watcher.add(dep);\n      }\n    }\n\n    deps.add(absFilename);\n  }\n\n  fileToDeps.set(absFilename, absDependencies);\n}\n\nfunction removeFileDependency(filename: string, dep: string) {\n  const deps = depToFiles.get(dep) as Set<string>;\n  deps.delete(filename);\n\n  if (deps.size === 0) {\n    depToFiles.delete(dep);\n\n    if (!hasStarted) {\n      watchQueue.delete(dep);\n    } else {\n      watcher.unwatch(dep);\n    }\n  }\n}\n\nfunction unwatchFile(filename: string) {\n  const deps = fileToDeps.get(filename);\n  if (!deps) return;\n\n  for (const dep of deps) {\n    removeFileDependency(filename, dep);\n  }\n  fileToDeps.delete(filename);\n}\n\nfunction requireChokidar(): any {\n  const require = createRequire(import.meta.url);\n\n  try {\n    return process.env.BABEL_8_BREAKING\n      ? require(\"chokidar\")\n      : parseInt(process.versions.node) >= 8\n      ? require(\"chokidar\")\n      : require(\"@nicolo-ribaudo/chokidar-2\");\n  } catch (err) {\n    console.error(\n      \"The optional dependency chokidar failed to install and is required for \" +\n        \"--watch. Chokidar is likely not supported on your platform.\",\n    );\n    throw err;\n  }\n}"
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