estree-util-value-to-estree

import { valueToEstree } from 'estree-util-value-to-estree'; import { generate } from 'astring'; // Commonly used to convert ESTree to code const exampleValue = { id: 123, name: 'Example Item', enabled: true, price: 99.95, details: ['alpha', 'beta', null], config: new Map([['key1', 'value1'], ['key2', 42n]]), created: new Date('2024-01-01T10:00:00Z'), pattern: /test/g, complex: { nested: Symbol.for('unique-id'), buffer: Buffer.from('hello'), // Unsupported types will require a custom serializer customClass: new class MyCustom { constructor() { this.prop = 'value'; } }() } }; // Convert a standard JavaScript value to an ESTree expression const estreeExpression = valueToEstree(exampleValue); console.log('Generated ESTree (partial):', estreeExpression.type); console.log('Generated Code for standard value:\n', generate(estreeExpression)); // Example with a custom serializer for the custom class const estreeWithCustom = valueToEstree(exampleValue, { serialize(value) { if (value instanceof Buffer) { // Convert Buffer to a Buffer.from() call return { type: 'CallExpression', callee: { type: 'MemberExpression', object: { type: 'Identifier', name: 'Buffer' }, property: { type: 'Identifier', name: 'from' }, computed: false, optional: false }, arguments: [{ type: 'Literal', value: value.toString('hex') }, { type: 'Literal', value: 'hex' }] }; } if (value && typeof value === 'object' && value.constructor.name === 'MyCustom') { // Convert MyCustom instance to a new MyCustom() expression return { type: 'NewExpression', callee: { type: 'Identifier', name: 'MyCustom' }, arguments: [] }; } // Let the default logic handle other types return undefined; } }); console.log('\nGenerated Code with custom serializer:\n', generate(estreeWithCustom));