Diagnostic message contains a stray "[object Object]"

[whatisaphone]

TypeScript Version: v4.0.0-dev.20200708

Search Terms: implicitly index signature map get

Code

interface Foo {
    bar: Map<string, string>;
}

declare const foo: Foo;

const nom = foo.bar['nom']; // error on this line

Expected behavior:

The error should say:

Element implicitly has an 'any' type because type 'Map<string, string>' has no index signature. Did you mean to call 'foo.bar.get'?

Actual behavior:

The error says:

Element implicitly has an 'any' type because type 'Map<string, string>' has no index signature. Did you mean to call 'foo.[object Object].get'?

Playground Link:

Playground Link

Related Issues:

[IllusionMH]

@RyanCavanaugh @elibarzilay can I take an attempt on this one? PR will be in 30-40 min

[RyanCavanaugh]

@IllusionMH that'd be wonderful!

[IllusionMH]

Typed PR message. So close... 😄

@a-tarasyuk I think your will be preferable because I wasn't aware of entityNameToString and used unescapeLeadingUnderscores(expr.name.escapedText) to match approach existing in same function

TypeScript/src/compiler/utilities.ts

Line 4764 in 03c79d7

return unescapeLeadingUnderscores(expr.escapedText);

Maybe make sense to align them?