Valid ES6 allowJs error TS8014: 'property declarations' can only be used in a .ts file.

[dave-hillier]

TypeScript Version:

1.8.2

Code

// A self-contained demonstration of the problem follows...
class Repro
{
    static property = {
    foo: "bar"
    };
}

tsc --allowJs --out out.js repro.js

Expected behavior:

Compiles without error

Actual behavior:

repro.js(3,5): error TS8014: 'property declarations' can only be used in a .ts file.

[RyanCavanaugh]

Duplicate of #6997

[RyanCavanaugh]

Just to confirm, are you also transpiling with Babel's Stage 0 preset?

[dave-hillier]

I haven't got that far yet. I wanted to try out the allowJs option on an existing code base. I simply ran tsc to reproduce this. I might just switch to using full typescript

[RyanCavanaugh]

If you don't have an external transpiler in the toolchain, then that error message is definitely correct -- this code doesn't run on any current JS runtime.

[dave-hillier]

so allowJs doesnt support ES6 in? Is this not fully approved code?

[RyanCavanaugh]

This isn't ES6 syntax. ES6 does not have property initializers.