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=== tests/cases/compiler/defaultParameterAddsUndefinedWithStrictNullChecks.ts ===
function f(addUndefined1 = "J", addUndefined2?: number) {
>f : Symbol(f, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 0, 0))
>addUndefined1 : Symbol(addUndefined1, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 0, 11))
>addUndefined2 : Symbol(addUndefined2, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 0, 31))
return addUndefined1.length + (addUndefined2 || 0);
>addUndefined1.length : Symbol(String.length, Decl(lib.es5.d.ts, --, --))
>addUndefined1 : Symbol(addUndefined1, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 0, 11))
>length : Symbol(String.length, Decl(lib.es5.d.ts, --, --))
>addUndefined2 : Symbol(addUndefined2, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 0, 31))
}
function g(addUndefined = "J", addDefined: number) {
>g : Symbol(g, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 2, 1))
>addUndefined : Symbol(addUndefined, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 3, 11))
>addDefined : Symbol(addDefined, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 3, 30))
return addUndefined.length + addDefined;
>addUndefined.length : Symbol(String.length, Decl(lib.es5.d.ts, --, --))
>addUndefined : Symbol(addUndefined, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 3, 11))
>length : Symbol(String.length, Decl(lib.es5.d.ts, --, --))
>addDefined : Symbol(addDefined, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 3, 30))
}
let total = f() + f('a', 1) + f('b') + f(undefined, 2);
>total : Symbol(total, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 6, 3))
>f : Symbol(f, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 0, 0))
>f : Symbol(f, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 0, 0))
>f : Symbol(f, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 0, 0))
>f : Symbol(f, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 0, 0))
>undefined : Symbol(undefined)
total = g('c', 3) + g(undefined, 4);
>total : Symbol(total, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 6, 3))
>g : Symbol(g, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 2, 1))
>g : Symbol(g, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 2, 1))
>undefined : Symbol(undefined)
function foo1(x: string = "string", b: number) {
>foo1 : Symbol(foo1, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 7, 36))
>x : Symbol(x, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 9, 14))
>b : Symbol(b, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 9, 35))
x.length;
>x.length : Symbol(String.length, Decl(lib.es5.d.ts, --, --))
>x : Symbol(x, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 9, 14))
>length : Symbol(String.length, Decl(lib.es5.d.ts, --, --))
}
function foo2(x = "string", b: number) {
>foo2 : Symbol(foo2, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 11, 1))
>x : Symbol(x, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 13, 14))
>b : Symbol(b, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 13, 27))
x.length; // ok, should be string
>x.length : Symbol(String.length, Decl(lib.es5.d.ts, --, --))
>x : Symbol(x, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 13, 14))
>length : Symbol(String.length, Decl(lib.es5.d.ts, --, --))
}
function foo3(x: string | undefined = "string", b: number) {
>foo3 : Symbol(foo3, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 15, 1))
>x : Symbol(x, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 17, 14))
>b : Symbol(b, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 17, 47))
x.length; // ok, should be string
>x.length : Symbol(String.length, Decl(lib.es5.d.ts, --, --))
>x : Symbol(x, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 17, 14))
>length : Symbol(String.length, Decl(lib.es5.d.ts, --, --))
x = undefined;
>x : Symbol(x, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 17, 14))
>undefined : Symbol(undefined)
}
function foo4(x: string | undefined = undefined, b: number) {
>foo4 : Symbol(foo4, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 20, 1))
>x : Symbol(x, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 22, 14))
>undefined : Symbol(undefined)
>b : Symbol(b, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 22, 48))
x; // should be string | undefined
>x : Symbol(x, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 22, 14))
x = undefined;
>x : Symbol(x, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 22, 14))
>undefined : Symbol(undefined)
}
type OptionalNullableString = string | null | undefined;
>OptionalNullableString : Symbol(OptionalNullableString, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 25, 1))
function allowsNull(val: OptionalNullableString = "") {
>allowsNull : Symbol(allowsNull, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 27, 56))
>val : Symbol(val, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 28, 20))
>OptionalNullableString : Symbol(OptionalNullableString, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 25, 1))
val = null;
>val : Symbol(val, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 28, 20))
val = 'string and null are both ok';
>val : Symbol(val, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 28, 20))
}
allowsNull(null); // still allows passing null
>allowsNull : Symbol(allowsNull, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 27, 56))
// .d.ts should have `string | undefined` for foo1, foo2, foo3 and foo4
foo1(undefined, 1);
>foo1 : Symbol(foo1, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 7, 36))
>undefined : Symbol(undefined)
foo2(undefined, 1);
>foo2 : Symbol(foo2, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 11, 1))
>undefined : Symbol(undefined)
foo3(undefined, 1);
>foo3 : Symbol(foo3, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 15, 1))
>undefined : Symbol(undefined)
foo4(undefined, 1);
>foo4 : Symbol(foo4, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 20, 1))
>undefined : Symbol(undefined)
function removeUndefinedButNotFalse(x = true) {
>removeUndefinedButNotFalse : Symbol(removeUndefinedButNotFalse, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 40, 19))
>x : Symbol(x, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 43, 36))
if (x === false) {
>x : Symbol(x, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 43, 36))
return x;
>x : Symbol(x, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 43, 36))
}
}
declare const cond: boolean;
>cond : Symbol(cond, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 49, 13))
function removeNothing(y = cond ? true : undefined) {
>removeNothing : Symbol(removeNothing, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 49, 28))
>y : Symbol(y, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 50, 23))
>cond : Symbol(cond, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 49, 13))
>undefined : Symbol(undefined)
if (y !== undefined) {
>y : Symbol(y, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 50, 23))
>undefined : Symbol(undefined)
if (y === false) {
>y : Symbol(y, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 50, 23))
return y;
>y : Symbol(y, Decl(defaultParameterAddsUndefinedWithStrictNullChecks.ts, 50, 23))
}
}
return true;
}
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