index.d.ts line 8 uses declare module looksSame which causes the following error using the new tsgo TypeScript compiler.

index.d.ts(8,16): error TS1540: A 'namespace' declaration should not be declared using the 'module' keyword. Please use the 'namespace' keyword instead.

Fix:

-declare module looksSame {
+declare namespace looksSame {

See microsoft/TypeScript#62876, microsoft/typescript-go#2760, microsoft/typescript-go#2873