This Refer

code in module and class enable strict mode by default

browser

• globalThis always refer to window
• this in global within strict or non-strict mode refer to window
• this in non-arrow function refer to window within non-strict mode, refer to undefined within strict mode
• this in arrow function refer to it parent domain this
• variable declared with var in global is seted to window
• variable defined without declaring is seted to window within non-strict mode, and will throw error within strict mode

nodejs

• globalThis always refer to global
• this in global within strict or non-strict mode refer to plain object {}, notice: not global object
• this in non-arrow function refer to global within non-strict mode, refer to undefined within strict mode
• this in arrow function refer to it parent domain this
• variable declared with var in global is not seted to global
• variable defined without declaring is seted to global within non-strict mode, and will throw error within strict mode