Function emitNextAffectedFile

test/fixtures/snapshot/typescript.js:120829–120864

* Emits the next affected file's emit result (EmitResult and sourceFiles emitted) or returns undefined if iteration is complete * The first of writeFile if provided, writeFile of BuilderProgramHost if provided, writeFile of compiler host * in that order would be used to write the f

(writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers)

         * in that order would be used to write the files
         */
        function emitNextAffectedFile(writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers) {
            var affected = getNextAffectedFile(state, cancellationToken, computeHash, host);
            var emitKind = 1 /* BuilderFileEmit.Full */;
            var isPendingEmitFile = false;
            if (!affected) {
                if (!ts.outFile(state.compilerOptions)) {
                    var pendingAffectedFile = getNextAffectedFilePendingEmit(state);
                    if (!pendingAffectedFile) {
                        if (!state.buildInfoEmitPending) {
                            return undefined;
                        }
                        var affected_1 = ts.Debug.checkDefined(state.program);
                        return toAffectedFileEmitResult(state, 
                        // When whole program is affected, do emit only once (eg when --out or --outFile is specified)
                        // Otherwise just affected file
                        affected_1.emitBuildInfo(writeFile || ts.maybeBind(host, host.writeFile), cancellationToken), affected_1, 1 /* BuilderFileEmit.Full */, 
                        /*isPendingEmitFile*/ false, 
                        /*isBuildInfoEmit*/ true);
                    }
                    (affected = pendingAffectedFile.affectedFile, emitKind = pendingAffectedFile.emitKind);
                    isPendingEmitFile = true;
                }
                else {
                    var program = ts.Debug.checkDefined(state.program);
                    if (state.programEmitComplete)
                        return undefined;
                    affected = program;
                }
            }
            return toAffectedFileEmitResult(state, 
            // When whole program is affected, do emit only once (eg when --out or --outFile is specified)
            // Otherwise just affected file
            ts.Debug.checkDefined(state.program).emit(affected === state.program ? undefined : affected, affected !== state.program && ts.getEmitDeclarations(state.compilerOptions) && !customTransformers ?
                getWriteFileUpdatingSignatureCallback(writeFile) :
                writeFile || ts.maybeBind(host, host.writeFile), cancellationToken, emitOnlyDtsFiles || emitKind === 0 /* BuilderFileEmit.DtsOnly */, customTransformers), affected, emitKind, isPendingEmitFile);
        }
        function getWriteFileUpdatingSignatureCallback(writeFile) {
            return function (fileName, text, writeByteOrderMark, onError, sourceFiles, data) {
                var _a;