brian schermerhorn elderbas

elderbas / removeUnusedUseEffectImport.js

Created May 5, 2021 21:15

codemod script to remove useEffect if it's not being used

	module.exports = function (file, api) {
	const j = api.jscodeshift;
	const { CallExpression, Identifier } = j;

	return getReactImportStatementNode()
	.forEach((node, index) => {
	node.value.specifiers.forEach((specifier, index) => {
	if (specifier.local.name === "useEffect") {
	if (!shouldKeepUseEffectImport()) {
	delete node.value.specifiers[index];

elderbas / add_import_statement.js

Created May 5, 2021 21:16

codemod script to add import statement of `useEffectOnce`

	export default (fileInfo, api) => {
	const j = api.jscodeshift;
	const root = j(fileInfo.source);
	const importLine = `import useEffectOnce from 'utils/useEffectOnce';`;
	const imports = root.find(j.ImportDeclaration);
	const n = imports.length;

	j(imports.at(n - 1).get()).insertAfter(importLine); // after the imports

	return root.toSource();

elderbas / callexpressions.js

Last active May 5, 2021 21:17

codemodscript to refactor `useEffect` with empty array to `useEffectOnce` without an array arg

	module.exports = function (file, api) {
	const j = api.jscodeshift;
	const { CallExpression, Identifier } = j;

	return (
	j(file.source)
	.find(CallExpression, {
	callee: {
	name: "useEffect",
	},