next
Version:
The React Framework
88 lines (87 loc) • 3.15 kB
JavaScript
/*
* Partially adapted from @babel/core (MIT license).
*/ import traverse from 'next/dist/compiled/babel/traverse';
import generate from 'next/dist/compiled/babel/generator';
import normalizeFile from 'next/dist/compiled/babel/core-lib-normalize-file';
import normalizeOpts from 'next/dist/compiled/babel/core-lib-normalize-opts';
import loadBlockHoistPlugin from 'next/dist/compiled/babel/core-lib-block-hoist-plugin';
import PluginPass from 'next/dist/compiled/babel/core-lib-plugin-pass';
import getConfig from './get-config';
import { consumeIterator } from './util';
function getTraversalParams(file, pluginPairs) {
const passPairs = [];
const passes = [];
const visitors = [];
for (const plugin of pluginPairs.concat(loadBlockHoistPlugin())){
const pass = new PluginPass(file, plugin.key, plugin.options);
passPairs.push([
plugin,
pass
]);
passes.push(pass);
visitors.push(plugin.visitor);
}
return {
passPairs,
passes,
visitors
};
}
function invokePluginPre(file, passPairs) {
for (const [{ pre }, pass] of passPairs){
if (pre) {
pre.call(pass, file);
}
}
}
function invokePluginPost(file, passPairs) {
for (const [{ post }, pass] of passPairs){
if (post) {
post.call(pass, file);
}
}
}
function transformAstPass(file, pluginPairs, parentSpan) {
const { passPairs, passes, visitors } = getTraversalParams(file, pluginPairs);
invokePluginPre(file, passPairs);
const visitor = traverse.visitors.merge(visitors, passes, // @ts-ignore - the exported types are incorrect here
file.opts.wrapPluginVisitorMethod);
parentSpan.traceChild('babel-turbo-traverse').traceFn(()=>traverse(file.ast, visitor, file.scope));
invokePluginPost(file, passPairs);
}
function transformAst(file, babelConfig, parentSpan) {
for (const pluginPairs of babelConfig.passes){
transformAstPass(file, pluginPairs, parentSpan);
}
}
export default async function transform(source, inputSourceMap, loaderOptions, filename, target, parentSpan) {
const getConfigSpan = parentSpan.traceChild('babel-turbo-get-config');
const babelConfig = await getConfig.call(this, {
source,
loaderOptions,
inputSourceMap,
target,
filename
});
if (!babelConfig) {
return {
code: source,
map: inputSourceMap
};
}
getConfigSpan.stop();
const normalizeSpan = parentSpan.traceChild('babel-turbo-normalize-file');
const file = consumeIterator(normalizeFile(babelConfig.passes, normalizeOpts(babelConfig), source));
normalizeSpan.stop();
const transformSpan = parentSpan.traceChild('babel-turbo-transform');
transformAst(file, babelConfig, transformSpan);
transformSpan.stop();
const generateSpan = parentSpan.traceChild('babel-turbo-generate');
const { code, map } = generate(file.ast, file.opts.generatorOpts, file.code);
generateSpan.stop();
return {
code,
map
};
}
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