Add codemods: CommonJS -> ES2015 module

bin/codemods/commonjs-exports

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+#!/usr/bin/env node
+
+/*
+	This codemod converts `module.exports` to `export` and `export default`.
+
+	How to use:
+	./bin/codemods/commonjs-exports path-to-transform/
+*/
+
+/**
+ * External dependencies
+ */
+const path = require( 'path' );
+const child_process = require( 'child_process' );
+
+/**
+ * Internal dependencies
+ */
+const config = require( './config' );
+const helpers = require( './helpers' );
+
+const args = process.argv.slice( 2 );
+if ( args.length === 0 ) {
+	process.stdout.write( 'No files to transform\n' );
+	process.exit( 0 );
+}
+
+const binArgs = [
+	// jscodeshift options
+	'--transform=node_modules/5to6-codemod/transforms/exports.js',
+	...config.jscodeshiftArgs,
+
+	// Recast options via 5to6
+	...config.recastArgs,
+
+	// Transform target
+	args[ 0 ],
+];
+const binPath = path.join( '.', 'node_modules', '.bin', 'jscodeshift' );
+const jscodeshift = child_process.spawn( binPath, binArgs );
+helpers.bindEvents( jscodeshift );

bin/codemods/commonjs-imports

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+#!/usr/bin/env node
+
+/*
+	This codemod converts occurrences of `require( '...' )` to `import ... from '...'`
+	only if they occurr on the top level scope. CommonJS imports inside block statements,
+	like conditionals or function definitions, will not be converted.
+
+	How to use:
+	./bin/codemods/commonjs-imports path-to-transform/
+*/
+
+/**
+ * External dependencies
+ */
+const path = require( 'path' );
+const child_process = require( 'child_process' );
+
+/**
+ * Internal dependencies
+ */
+const config = require( './config' );
+const helpers = require( './helpers' );
+
+const args = process.argv.slice( 2 );
+if ( args.length === 0 ) {
+	process.stdout.write( 'No files to transform\n' );
+	process.exit( 0 );
+}
+
+const binArgs = [
+	// jscodeshift options
+	'--transform=node_modules/5to6-codemod/transforms/cjs.js',
+	...config.jscodeshiftArgs,
+
+	// Recast options via 5to6
+	...config.recastArgs,
+
+	// Transform target
+	args[ 0 ],
+];
+const binPath = path.join( '.', 'node_modules', '.bin', 'jscodeshift' );
+const jscodeshift = child_process.spawn( binPath, binArgs );
+helpers.bindEvents( jscodeshift );

bin/codemods/commonjs-imports-hoist

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+#!/usr/bin/env node
+
+/*
+	This codemod hoists all occurrences of `require( '...' )` inside if, loop, and
+	function blocks. This can cause breakage! Use with caution.
+
+	How to use:
+	./bin/codemods/commonjs-imports path-to-transform/
+*/
+
+/**
+ * External dependencies
+ */
+const path = require( 'path' );
+const child_process = require( 'child_process' );
+
+/**
+ * Internal dependencies
+ */
+const config = require( './config' );
+const helpers = require( './helpers' );
+
+const args = process.argv.slice( 2 );
+if ( args.length === 0 ) {
+	process.stdout.write( 'No files to transform\n' );
+	process.exit( 0 );
+}
+
+const binArgs = [
+	// jscodeshift options
+	'--transform=node_modules/5to6-codemod/transforms/cjs.js',
+	...config.jscodeshiftArgs,
+
+	// Recast options via 5to6
+	...config.recastArgs,
+
+	// 5to6 transform options
+	'--hoist=true',
+
+	// Transform target
+	args[ 0 ],
+];
+const binPath = path.join( '.', 'node_modules', '.bin', 'jscodeshift' );
+const jscodeshift = child_process.spawn( binPath, binArgs );
+helpers.bindEvents( jscodeshift );

bin/codemods/config.js

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+const jscodeshiftArgs = [
+	'--extensions=js,jsx',
+];
+
+// Used primarily by 5to6-codemod transformations
+const recastArgs = [
+	'--useTabs=true',
+	'--arrayBracketSpacing=true',
+];
+
+module.exports = {
+	jscodeshiftArgs,
+	recastArgs,
+};

bin/codemods/helpers.js

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+function bindEvents( jscodeshiftProcess ) {
+	jscodeshiftProcess.stdout.on( 'data', ( data ) => {
+		process.stdout.write( data );
+	} );
+
+	jscodeshiftProcess.stderr.on( 'data', ( data ) => {
+		process.stderr.write( data );
+	} );
+}
+
+module.exports = {
+	bindEvents,
+};

bin/codemods/named-exports-from-default

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+#!/usr/bin/env node
+
+/*
+	This codemod generates named exports given a `default export { ... }`.
+	This can be useful in transitioning away from namespace imports
+	(`import * as blah from 'blah'`) to named imports (`import named from 'blah'`).
+
+	How to use:
+	./bin/codemods/named-export-from-default path-to-transform/
+*/
+
+/**
+ * External dependencies
+ */
+const path = require( 'path' );
+const child_process = require( 'child_process' );
+
+/**
+ * Internal dependencies
+ */
+const config = require( './config' );
+const helpers = require( './helpers' );
+
+const args = process.argv.slice( 2 );
+if ( args.length === 0 ) {
+	process.stdout.write( 'No files to transform\n' );
+	process.exit( 0 );
+}
+
+const binArgs = [
+	// jscodeshift options
+	'--transform=node_modules/5to6-codemod/transforms/named-export-generation.js',
+	...config.jscodeshiftArgs,
+
+	// Recast options via 5to6
+	...config.recastArgs,
+
+	// Transform target
+	args[ 0 ],
+];
+const binPath = path.join( '.', 'node_modules', '.bin', 'jscodeshift' );
+const jscodeshift = child_process.spawn( binPath, binArgs );
+helpers.bindEvents( jscodeshift );