function transform(file, { j }, options) { const root = j(file.source); const { identifier } = removeImport('is-odd', root, j); root .find(j.CallExpression, { callee: { type: 'Identifier', name: identifier } }) .forEach((path) => { const argument = path.node.arguments[0]; const newExpression = j.binaryExpression( '!==', j.binaryExpression( '%', // @ts-expect-error j.literal(argument.value), j.literal(2) ), j.literal(0) ); const wrappedExpression = j.parenthesizedExpression(newExpression); j(path).replaceWith(wrappedExpression); }); return root.toSource(options); } export default transform; function removeImport(name, root, j) { // Find the import or require statement for 'is-boolean-object' const importDeclaration = root.find(j.ImportDeclaration, { source: { value: name } }); const requireDeclaration = root .find(j.CallExpression, { callee: { name: 'require' }, arguments: [ { value: name } ] }) .closest(j.VariableDeclarator); // Require statements without declarations like `Object.is = require("object-is");` const requireAssignment = root.find(j.AssignmentExpression, { operator: '=', right: { callee: { name: 'require' }, arguments: [ { value: name } ] } }); // Side effect requires statements like `require("error-cause/auto");` const sideEffectRequireExpression = root.find(j.ExpressionStatement, { expression: { callee: { name: 'require' }, arguments: [ { value: name } ] } }); // Return the identifier name, e.g. 'fn' in `import { fn } from 'is-boolean-object'` // or `var fn = require('is-boolean-object')` const identifier = importDeclaration.paths().length > 0 ? importDeclaration.get().node.specifiers[0].local.name : requireDeclaration.paths().length > 0 ? requireDeclaration.find(j.Identifier).get().node.name : requireAssignment.paths().length > 0 ? requireAssignment.find(j.Identifier).get().node.name : null; importDeclaration.remove(); requireDeclaration.remove(); requireAssignment.remove(); sideEffectRequireExpression.remove(); const dirtyFlag = importDeclaration.length > 0 || requireDeclaration.length > 0 || requireAssignment.length > 0 || sideEffectRequireExpression.length > 0; return { identifier, dirtyFlag }; }
Input
const isOdd = require('is-odd'); console.log(isOdd('1')); //=> true console.log(isOdd('3')); //=> true console.log(isOdd(0)); //=> false console.log(isOdd(2)); //=> false
Output
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