Flow: Internal error: merge job timed out after 105.16 seconds

[jfirebaugh]

Looks similar to #5870 and #5831. I have a small reduced test case. Not linking to flow.org/try/ because it just spins forever.

// @flow

type A = {kind: 'a', e: Type};
type B = {kind: 'b', k: Type, v: Type};
type C = {kind: 'c'};
type Type = A | B | C;

type TypeCases<R> = {|
    a: (A) => R,
    b: (B) => R,
    c: (C) => R
|};

function matcher<R>(cases: TypeCases<R>): (Type) => R {
    return (type) => cases[type.kind](type);
}

const f = matcher({
    a: (a: A) => [...f(a.e)],
    b: (b: B) => [...f(b.k), ...f(b.v)],
    c: () =>  ['']
});

With 0.70.0, this hangs in the "merged files" step, then eventually times out:

Internal error: merge job timed out after 105.16 seconds

[avikchaudhuri]

This will be fixed in 0.71.

[pizzarob]

Getting this error in 0.82.0

[devstein]

Getting this error in 0.93.0. Is there any way to find out what is causing it?

[FezVrasta]

0.108.0 still has it

[ahujsak]

has anyone come up with a solution for this. Just started happening with our project.

[leoselig]

@ahujsak Unfortunately not. We ended up increasing the timeout more and more while we migrated our entire huge repo to TypeScript. At the end of the migration, the timeout was set to 1000 seconds to make it pass.