Template not compiling with TS 2.9

[macstr1k3r]

When trying to use this module with Typescript 2.9 the following error pops up.

dare@mbp ~/dev/ecs-ms (master *)]$ npm i typescript@2.9

+ typescript@2.9.2
updated 1 package and audited 4 packages in 2.607s
found 0 vulnerabilities

[dare@mbp ~/dev/ecs-ms (master *)]$ ./node_modules/.bin/tsc -p .
node_modules/cloudformation-declarations/src/declarations/core.ts:7:55 - error TS2344: Type 'keyof T' does not satisfy the constraint 'string'.
  Type 'string | number | symbol' is not assignable to type 'string'.
    Type 'number' is not assignable to type 'string'.

7 export type Omit<T, K extends keyof T> = Pick<T, Diff<keyof T, K>>;
                                                        ~~~~~~~

[macstr1k3r]

This comes from the change introduced in TS 2.9 https://www.typescriptlang.org/docs/handbook/release-notes/typescript-2-9.html

• An index type keyof T for some type T is a subtype of string | number | symbol.

a workaround is to use the --keyofStringsOnly compiler flag

[cspotcode]

Thanks for reporting this. We can also switch to using a StringKeyOf<T> generic.

type StringKeyOf<T> = Extract<keyof T, string>;