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Checker Diagnostics

Within initializeTypeChecker the following code exists:
// Initialize global symbol table
forEach(host.getSourceFiles(), file => {
if (!isExternalModule(file)) {
mergeSymbolTable(globals, file.locals);
}
});
Which basically merges all the global symbols into the let globals: SymbolTable = {}; (in createTypeChecker) SymbolTable. mergeSymbolTable primarily calls mergeSymbol.