37 lines
1.3 KiB
JavaScript
Executable File
37 lines
1.3 KiB
JavaScript
Executable File
#!/usr/bin/env node
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"use strict";
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var visitors = require('../vendor/fbtransform/visitors').transformVisitors;
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var transform = require('../vendor/fbtransform/lib/transform').transform;
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var propagate = require("../vendor/constants").propagate;
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require("commoner").resolve(function(id) {
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var context = this;
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// Note that the result of context.getProvidedP() is cached for the
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// duration of the build, so it is both consistent and cheap to
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// evaluate multiple times.
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return context.getProvidedP().then(function(idToPath) {
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// If a module declares its own identifier using @providesModule
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// then that identifier will be a key in the idToPath object.
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if (idToPath.hasOwnProperty(id)) {
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return context.readFileP(idToPath[id]);
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}
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// Otherwise assume the identifier maps directly to a path in the
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// filesystem.
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return context.readModuleP(id);
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});
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}).process(function(id, source) {
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var context = this;
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var constants = context.config.constants || {};
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// This is where JSX, ES6, etc. desugaring happens.
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source = transform(visitors.react, source).code;
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// Constant propagation means removing any obviously dead code after
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// replacing constant expressions with literal (boolean) values.
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return propagate(constants, source);
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});
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