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Source-loader: Bypass if file has no exports #9505

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merged 1 commit into from Jan 17, 2020
Merged

Source-loader: Bypass if file has no exports #9505

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8 changes: 8 additions & 0 deletions examples/official-storybook/stories/core/reexport-source-loader.stories.js
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@@ -0,0 +1,8 @@
export default {
title: 'Core/Re-export source loader',
};

const Story1 = () => 'story1';
const Story2 = () => 'story2';

export { Story1, Story2 };
17 changes: 14 additions & 3 deletions lib/source-loader/src/server/build.js
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Expand Up @@ -3,7 +3,16 @@ import { getRidOfUselessFilePrefixes } from './dependencies-lookup/getRidOfUsele

export function transform(inputSource) {
return readStory(this, inputSource)
.then(getRidOfUselessFilePrefixes)
.then(sourceObject => {
// if source-loader had trouble parsing the story exports, return the original story
// example is
// const myStory = () => xxx
// export { myStory }
if (!sourceObject.source || sourceObject.source.length === 0) {
return { source: inputSource };
}
return getRidOfUselessFilePrefixes(sourceObject);
})
.then(
({
prefix,
Expand All @@ -15,7 +24,8 @@ export function transform(inputSource) {
localDependencies,
idsToFrameworks,
}) => {
const preamble = `
const preamble = prefix
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what's the concept of prefix? can you make a short comment above this line?

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Its not specific to prefix, just to signify the source loader is not parsing this file. Also prevents an rte since prefix was being used without a check below

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added comment

? `
/* eslint-disable */
// @ts-nocheck
// @ts-ignore
Expand All @@ -36,7 +46,8 @@ var __MODULE_DEPENDENCIES__ = ${JSON.stringify(dependencies)};
var __LOCAL_DEPENDENCIES__ = ${JSON.stringify(localDependencies)};
// @ts-ignore
var __IDS_TO_FRAMEWORKS__ = ${JSON.stringify(idsToFrameworks)};
`;
`
: '';
return `${preamble}\n${source}`;
}
);
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