Make error message prefixes more descriptive

packages/babel-core/src/config/full.ts

@@ -220,7 +220,9 @@ function enhanceError<T extends Function>(context: ConfigContext, fn: T): T {
       // There are a few case where thrown errors will try to annotate themselves multiple times, so
       // to keep things simple we just bail out if re-wrapping the message.
       if (!/^\[BABEL\]/.test(e.message)) {
-        e.message = `[BABEL] ${context.filename || "unknown"}: ${e.message}`;
+        e.message = `[BABEL] ${context.filename ?? "unknown file"}: ${
+          e.message
+        }`;
       }
 
       throw e;

packages/babel-core/src/transformation/index.ts

@@ -46,7 +46,7 @@ export function* run(
   try {
     yield* transformFile(file, config.passes);
   } catch (e) {
-    e.message = `${opts.filename ?? "unknown"}: ${e.message}`;
+    e.message = `${opts.filename ?? "unknown file"}: ${e.message}`;
     if (!e.code) {
       e.code = "BABEL_TRANSFORM_ERROR";
     }
@@ -59,7 +59,7 @@ export function* run(
       ({ outputCode, outputMap } = generateCode(config.passes, file));
     }
   } catch (e) {
-    e.message = `${opts.filename ?? "unknown"}: ${e.message}`;
+    e.message = `${opts.filename ?? "unknown file"}: ${e.message}`;
     if (!e.code) {
       e.code = "BABEL_GENERATE_ERROR";
     }

packages/babel-core/test/__snapshots__/option-manager.js.snap

@@ -1,7 +1,7 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
 exports[`option-manager config plugin/preset flattening and overriding should throw when an option is following a preset 1`] = `
-"[BABEL] unknown: Unknown option: .useSpread. Check out https://babeljs.io/docs/en/babel-core/#options for more information about options.
+"[BABEL] unknown file: Unknown option: .useSpread. Check out https://babeljs.io/docs/en/babel-core/#options for more information about options.
 - Maybe you meant to use
 \\"presets\\": [
   [\\"./fixtures/option-manager/babel-preset-bar\\", {
@@ -12,7 +12,7 @@ To be a valid preset, its name and options should be wrapped in a pair of bracke
 `;
 
 exports[`option-manager config plugin/preset flattening and overriding should throw when an option is provided as a plugin 1`] = `
-"[BABEL] unknown: .useSpread is not a valid Plugin property
+"[BABEL] unknown file: .useSpread is not a valid Plugin property
 - Maybe you meant to use
 \\"plugins\\": [
   [\\"./fixtures/option-manager/babel-plugin-foo\\", {
@@ -23,7 +23,7 @@ To be a valid plugin, its name and options should be wrapped in a pair of bracke
 `;
 
 exports[`option-manager config plugin/preset flattening and overriding should throw when an option is provided as a preset 1`] = `
-"[BABEL] unknown: Unknown option: .useBuiltIns. Check out https://babeljs.io/docs/en/babel-core/#options for more information about options.
+"[BABEL] unknown file: Unknown option: .useBuiltIns. Check out https://babeljs.io/docs/en/babel-core/#options for more information about options.
 - Maybe you meant to use
 \\"presets\\": [
   [\\"./fixtures/option-manager/babel-preset-bar\\", {

packages/babel-core/test/api.js

@@ -947,7 +947,9 @@ describe("api", function () {
             },
           ],
         }),
-      ).toThrowErrorMatchingInlineSnapshot(`"unknown: Unknown helper fooBar"`);
+      ).toThrowErrorMatchingInlineSnapshot(
+        `"unknown file: Unknown helper fooBar"`,
+      );
     });
   });
 });

packages/babel-core/test/async.js

@@ -123,7 +123,7 @@ describe("asynchronicity", () => {
         process.chdir("plugin");
 
         expect(() => babel.transformSync("")).toThrow(
-          `[BABEL] unknown: You appear to be using an async plugin/preset, but Babel` +
+          `[BABEL] unknown file: You appear to be using an async plugin/preset, but Babel` +
             ` has been called synchronously`,
         );
       });
@@ -144,7 +144,7 @@ describe("asynchronicity", () => {
         expect(() =>
           babel.transformSync(""),
         ).toThrowErrorMatchingInlineSnapshot(
-          `"unknown: You appear to be using an plugin with an async .pre, which your current version` +
+          `"unknown file: You appear to be using an plugin with an async .pre, which your current version` +
             ` of Babel does not support. If you're using a published plugin, you may need to upgrade your` +
             ` @babel/core version."`,
         );
@@ -156,7 +156,7 @@ describe("asynchronicity", () => {
         await expect(
           babel.transformAsync(""),
         ).rejects.toThrowErrorMatchingInlineSnapshot(
-          `"unknown: You appear to be using an plugin with an async .pre, which your current version` +
+          `"unknown file: You appear to be using an plugin with an async .pre, which your current version` +
             ` of Babel does not support. If you're using a published plugin, you may need to upgrade your` +
             ` @babel/core version."`,
         );
@@ -170,7 +170,7 @@ describe("asynchronicity", () => {
         expect(() =>
           babel.transformSync(""),
         ).toThrowErrorMatchingInlineSnapshot(
-          `"unknown: You appear to be using an plugin with an async .post, which your current version` +
+          `"unknown file: You appear to be using an plugin with an async .post, which your current version` +
             ` of Babel does not support. If you're using a published plugin, you may need to upgrade your` +
             ` @babel/core version."`,
         );
@@ -182,7 +182,7 @@ describe("asynchronicity", () => {
         await expect(
           babel.transformAsync(""),
         ).rejects.toThrowErrorMatchingInlineSnapshot(
-          `"unknown: You appear to be using an plugin with an async .post, which your current version` +
+          `"unknown file: You appear to be using an plugin with an async .post, which your current version` +
             ` of Babel does not support. If you're using a published plugin, you may need to upgrade your` +
             ` @babel/core version."`,
         );
@@ -194,7 +194,7 @@ describe("asynchronicity", () => {
         process.chdir("plugin-inherits");
 
         expect(() => babel.transformSync("")).toThrow(
-          `[BABEL] unknown: You appear to be using an async plugin/preset, but Babel has been` +
+          `[BABEL] unknown file: You appear to be using an async plugin/preset, but Babel has been` +
             ` called synchronously`,
         );
       });
@@ -234,7 +234,7 @@ describe("asynchronicity", () => {
         process.chdir("preset");
 
         expect(() => babel.transformSync("")).toThrow(
-          `[BABEL] unknown: You appear to be using an async plugin/preset, ` +
+          `[BABEL] unknown file: You appear to be using an async plugin/preset, ` +
             `but Babel has been called synchronously`,
         );
       });
@@ -253,7 +253,7 @@ describe("asynchronicity", () => {
         process.chdir("preset-plugin-promise");
 
         expect(() => babel.transformSync("")).toThrow(
-          `[BABEL] unknown: You appear to be using a promise as a plugin, which your` +
+          `[BABEL] unknown file: You appear to be using a promise as a plugin, which your` +
             ` current version of Babel does not support. If you're using a published` +
             ` plugin, you may need to upgrade your @babel/core version. As an` +
             ` alternative, you can prefix the promise with "await".`,
@@ -264,7 +264,7 @@ describe("asynchronicity", () => {
         process.chdir("preset-plugin-promise");
 
         await expect(babel.transformAsync("")).rejects.toThrow(
-          `[BABEL] unknown: You appear to be using a promise as a plugin, which your` +
+          `[BABEL] unknown file: You appear to be using a promise as a plugin, which your` +
             ` current version of Babel does not support. If you're using a published` +
             ` plugin, you may need to upgrade your @babel/core version. As an` +
             ` alternative, you can prefix the promise with "await".`,

packages/babel-core/test/errors-stacks.js

@@ -207,7 +207,7 @@ describe("@babel/core errors", function () {
         root: fixture("use-exclude-in-preset"),
       });
     }).toMatchInlineSnapshot(`
-      "Error: [BABEL] unknown: Preset /* your preset */ requires a filename to be set when babel is called directly,
+      "Error: [BABEL] unknown file: Preset /* your preset */ requires a filename to be set when babel is called directly,
       \`\`\`
       babel.transformSync(code, { filename: 'file.ts', presets: [/* your preset */] });
       \`\`\`

packages/babel-core/test/fixtures/plugins/build-code-frame-error/exec.js

@@ -15,4 +15,4 @@ expect(() => {
     // hard to assert on ANSI escape codes
     highlightCode: false,
   });
-}).toThrow(/^unknown: someMsg\s+> 1 \| function f\(\) {}/);
+}).toThrow(/^unknown file: someMsg\s+> 1 \| function f\(\) {}/);