feat(core): Make error message prefixes more descriptive

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

@@ -186,7 +186,7 @@ export default gensync<[any], ResolvedConfig | null>(function* loadFullConfig(
     // 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.js

@@ -42,7 +42,7 @@ export function* run(
   try {
     yield* transformFile(file, config.passes);
   } catch (e) {
-    e.message = `${opts.filename ?? "unknown"}: ${e.message}`;
+    e.message = `${opts.filename ?? "unknown file"}: ${e.message}`;
     if (!e.code) {
       e.code = "BABEL_TRANSFORM_ERROR";
     }
@@ -55,7 +55,7 @@ export function* run(
       ({ outputCode, outputMap } = generateCode(config.passes, file));
     }
   } catch (e) {
-    e.message = `${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
 \\"preset\\": [
   [\\"./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
 \\"plugin\\": [
   [\\"./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
 \\"preset\\": [
   [\\"./fixtures/option-manager/babel-preset-bar\\", {

packages/babel-core/test/async.js

@@ -114,7 +114,7 @@ describe("asynchronicity", () => {
         expect(() =>
           babel.transformSync(""),
         ).toThrowErrorMatchingInlineSnapshot(
-          `"[BABEL] unknown: You appear to be using an async plugin, which your current version of Babel` +
+          `"[BABEL] unknown file: You appear to be using an async 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."`,
         );
@@ -126,7 +126,7 @@ describe("asynchronicity", () => {
         await expect(
           babel.transformAsync(""),
         ).rejects.toThrowErrorMatchingInlineSnapshot(
-          `"[BABEL] unknown: You appear to be using an async plugin, which your current version of Babel` +
+          `"[BABEL] unknown file: You appear to be using an async 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."`,
         );
@@ -140,7 +140,7 @@ 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."`,
         );
@@ -152,7 +152,7 @@ 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."`,
         );
@@ -166,7 +166,7 @@ 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."`,
         );
@@ -178,7 +178,7 @@ 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."`,
         );
@@ -192,7 +192,7 @@ describe("asynchronicity", () => {
         expect(() =>
           babel.transformSync(""),
         ).toThrowErrorMatchingInlineSnapshot(
-          `"[BABEL] unknown: You appear to be using an async plugin, which your current version of Babel` +
+          `"[BABEL] unknown file: You appear to be using an async 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."`,
         );
@@ -204,7 +204,7 @@ describe("asynchronicity", () => {
         await expect(
           babel.transformAsync(""),
         ).rejects.toThrowErrorMatchingInlineSnapshot(
-          `"[BABEL] unknown: You appear to be using an async plugin, which your current version of Babel` +
+          `"[BABEL] unknown file: You appear to be using an async 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."`,
         );

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\(\) {}/);