40 lines
1.1 KiB
JavaScript
40 lines
1.1 KiB
JavaScript
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/* eslint no-console:0 */
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/** Find constants (identified by ALL_CAPS_DECLARATIONS), and inline them globally.
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* This is safe because Preact *only* uses global constants.
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*/
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export default (file, api) => {
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let j = api.jscodeshift,
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code = j(file.source),
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constants = {},
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found = 0;
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code.find(j.VariableDeclaration)
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.filter( decl => {
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for (let i=decl.value.declarations.length; i--; ) {
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let node = decl.value.declarations[i],
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name = node.id && node.id.name,
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init = node.init;
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if (name && init && name.match(/^[A-Z0-9_$]+$/g)) {
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if (init.type==='Literal') {
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console.log(`Inlining constant: ${name}=${init.raw}`);
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found++;
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constants[name] = init;
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// remove declaration
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decl.value.declarations.splice(i, 1);
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// if it's the last, we'll remove the whole statement
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return !decl.value.declarations.length;
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}
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}
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}
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return false;
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})
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.remove();
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code.find(j.Identifier)
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.filter( path => path.value.name && constants.hasOwnProperty(path.value.name) )
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.replaceWith( path => (found++, constants[path.value.name]) );
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return found ? code.toSource({ quote: 'single' }) : null;
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};
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