TypeScript变量在运行时有效，但在编译过程中会中断-作用域

Question

I'm trying to reference a variable inside a TypeScript function that breaks compile but works fine at run time. This line breaks the compile:

console.log( EXP_SETTINGS.site.userInterface.showPostbackStatusDelay );

The reason I know it works at runtime is because I did the following:

1. Commented out the offending line.
2. Did a compile in VS2015 Pro - success.
3. Found js file generated by TS compile, which is named JSUI.js.
4. Inserted the offending line in the precise corresponding place, saved.
5. Ran my web page in Chrome - no errors - correct value is emitted to console.

So...clearly the variable I need is available and in global scope, yet TS blows up during compile. How can I solve this?

Answer 1

If you're sure that variable is available to you, you can just declare it somewhere (at the base level) in your file:

declare const EXP_SETTINGS: any; // Replace any with appropriate type

This will allow you to reference it without typescript complaining. If you have a more specific type for it, I would recommend using that instead of any .

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Or, if you're only using the EXP_SETTINGS variable in one place, or you don't want to include a type for it, you can just manually silence the compiler with a ts-ignore comment:

// @ts-ignore
console.log( EXP_SETTINGS.site... );