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Throw better exception when failing to load plugin #447

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merged 3 commits into from
Nov 13, 2023
Merged

Throw better exception when failing to load plugin #447

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7cbb08a
feat: improve error for failing to import/require from package.json
JoshuaKGoldberg May 7, 2023
fa497c9
Merge branch 'main' into improve-load-package-json-error
JoshuaKGoldberg Sep 5, 2023
0fbad3d
Merge branch 'main' into improve-load-package-json-error
bmish Nov 13, 2023
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6 changes: 4 additions & 2 deletions lib/package-json.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -36,7 +36,7 @@ export async function loadPlugin(path: string): Promise<Plugin> {
try {
// Try require first which should work for CJS plugins.
return require(pluginRoot) as Plugin; // eslint-disable-line import/no-dynamic-require
} catch {
} catch (error) {
// Otherwise, for ESM plugins, we'll have to try to resolve the exact plugin entry point and import it.
const pluginPackageJson = loadPackageJson(path);
let pluginEntryPoint;
Expand All @@ -61,8 +61,10 @@ export async function loadPlugin(path: string): Promise<Plugin> {
}
}

// If the ESM export doesn't exist, fall back to throwing the CJS error
// (if the ESM export does exist, we'll validate it next)
if (!pluginEntryPoint) {
throw new Error('Unable to determine plugin entry point.');
throw error;
}

const pluginEntryPointAbs = join(pluginRoot, pluginEntryPoint);
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2 changes: 1 addition & 1 deletion test/lib/generate/cjs-test.ts
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Expand Up @@ -68,7 +68,7 @@ describe('generate (cjs)', function () {
'cjs-main-file-does-not-exist'
);
await expect(generate(FIXTURE_PATH)).rejects.toThrow(
'Unable to determine plugin entry point.'
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I tried to construct a package.json test case to throw the existing default error... and couldn't figure it out.

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I'll try to take a look at this so we can test the old exception still.

/Cannot find module/u
);
});
});
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