function writeMarkedNodes()

in build/lib/treeshaking.ts [587:663]
65 lines of code
33 McCabe index (conditional complexity)

		function writeMarkedNodes(node: ts.Node): void {
			if (getColor(node) === NodeColor.Black) {
				return keep(node);
			}

			// Always keep certain top-level statements
			if (ts.isSourceFile(node.parent)) {
				if (ts.isExpressionStatement(node) && ts.isStringLiteral(node.expression) && node.expression.text === 'use strict') {
					return keep(node);
				}

				if (ts.isVariableStatement(node) && nodeOrChildIsBlack(node)) {
					return keep(node);
				}
			}

			// Keep the entire import in import * as X cases
			if (ts.isImportDeclaration(node)) {
				if (node.importClause && node.importClause.namedBindings) {
					if (ts.isNamespaceImport(node.importClause.namedBindings)) {
						if (getColor(node.importClause.namedBindings) === NodeColor.Black) {
							return keep(node);
						}
					} else {
						let survivingImports: string[] = [];
						for (const importNode of node.importClause.namedBindings.elements) {
							if (getColor(importNode) === NodeColor.Black) {
								survivingImports.push(importNode.getFullText(sourceFile));
							}
						}
						const leadingTriviaWidth = node.getLeadingTriviaWidth();
						const leadingTrivia = sourceFile.text.substr(node.pos, leadingTriviaWidth);
						if (survivingImports.length > 0) {
							if (node.importClause && node.importClause.name && getColor(node.importClause) === NodeColor.Black) {
								return write(`${leadingTrivia}import ${node.importClause.name.text}, {${survivingImports.join(',')} } from${node.moduleSpecifier.getFullText(sourceFile)};`);
							}
							return write(`${leadingTrivia}import {${survivingImports.join(',')} } from${node.moduleSpecifier.getFullText(sourceFile)};`);
						} else {
							if (node.importClause && node.importClause.name && getColor(node.importClause) === NodeColor.Black) {
								return write(`${leadingTrivia}import ${node.importClause.name.text} from${node.moduleSpecifier.getFullText(sourceFile)};`);
							}
						}
					}
				} else {
					if (node.importClause && getColor(node.importClause) === NodeColor.Black) {
						return keep(node);
					}
				}
			}

			if (shakeLevel === ShakeLevel.ClassMembers && (ts.isClassDeclaration(node) || ts.isInterfaceDeclaration(node)) && nodeOrChildIsBlack(node)) {
				let toWrite = node.getFullText();
				for (let i = node.members.length - 1; i >= 0; i--) {
					const member = node.members[i];
					if (getColor(member) === NodeColor.Black || !member.name) {
						// keep method
						continue;
					}
					if (/^_(.*)Brand$/.test(member.name.getText())) {
						// TODO: keep all members ending with `Brand`...
						continue;
					}

					let pos = member.pos - node.pos;
					let end = member.end - node.pos;
					toWrite = toWrite.substring(0, pos) + toWrite.substring(end);
				}
				return write(toWrite);
			}

			if (ts.isFunctionDeclaration(node)) {
				// Do not go inside functions if they haven't been marked
				return;
			}

			node.forEachChild(writeMarkedNodes);
		}