function transform(file, { j }, options) { const root = j(file.source); const { identifier } = removeImport('arraybuffer.prototype.slice', root, j); let dirtyFlag = false; root .find(j.CallExpression, { callee: { type: 'Identifier', name: identifier } }) .forEach((path) => { const [bufferArg, ...otherArgs] = path.node.arguments; if ( j.Identifier.check(bufferArg) || (j.NewExpression.check(bufferArg) && bufferArg.callee.type === 'Identifier' && bufferArg.callee.name === 'ArrayBuffer') ) { path.replace( j.callExpression( j.memberExpression(bufferArg, j.identifier('slice')), otherArgs ) ); dirtyFlag = true; } }); return dirtyFlag ? root.toSource(options) : file.source; } 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 }; } export default transform;
Input
var assert = require('assert'); var slice = require('arraybuffer.prototype.slice'); var ab = new ArrayBuffer(1); var arr = new Uint8Array(ab); arr[0] = 123; var ab2 = slice(ab); var arr2 = new Uint8Array(ab2); arr2[0] = 234; assert.deepEqual(arr, new Uint8Array([123])); assert.deepEqual(arr2, new Uint8Array([234])); if (!ArrayBuffer.prototype.transfer) { slice.shim(); } var ab2 = ab.slice(); var arr2 = new Uint8Array(ab2); arr2[0] = 234; assert.deepEqual(arr, new Uint8Array([123])); assert.deepEqual(arr2, new Uint8Array([234]));
Output
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