JS-related-memo

Record the problem I met and the solution

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Probelm: Cannot use export/import with Node.js

Solution:

1. install two packages: babel-cli and babel-preset-env and save them both as dev dependancies. npm init npm install babel-cli babel-preset-env --save-dev

2. compile: ./node_modules/.bin/babel-node main.js

export.js: the js file contains the export function main.js (compile this with babel-node): the js file contains the import function

References: https://medium.com/@JedaiSaboteur/import-export-babel-and-node-a2e332d15673
https://medium.com/10coding/node-js-%E4%BD%BF%E7%94%A8-babel-%E5%81%9A-es6-%E9%96%8B%E7%99%BC-44b5b9e5f508

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Problem: Change the reading behavior inside module/class
for instance:
original: greet(){} <--> console.log(xxx.greet())
changed: get greet(){} <--> console.log(xxx.greet)

tsc cannot compile. error TS1056: Accessors are only available when targeting ECMAScript 5 and higher.

Solution: tsc --target es5 script.ts

References: https://stackoverflow.com/questions/41010780/accessors-are-only-available-when-targeting-ecmascript-5-and-higher