How to use duplexer - 2 common examples
To help you get started, we’ve selected a few duplexer examples, based on popular ways it is used in public projects.
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mysticatea / cpx / src / command.js View on Github 
return file => {
const env = Object.create(process.env, {FILE: {value: file}});
const parts = parseShellQuote(command, env);
const child = spawn(parts[0], parts.slice(1), {env});
const outer = duplexer(child.stdin, child.stdout);
child.on("exit", function(code) {
if (code !== 0) {
outer.emit(
"error",
new Error("non-zero exit code in command: " + command));
}
});
child.stderr.pipe(process.stderr);
return outer;
};
});const createReporter = () => {
const output = through2();
const p = parser();
const stream = duplexer(p, output);
const startedAt = Date.now();
const println = (input = '', indentLevel = 0) => {
let indent = '';
for (let i = 0; i < indentLevel; ++i) {
indent += INDENT;
}
input.split('\n').forEach(line => {
output.push(`${indent}${line}`);
output.push('\n');
});
};
const handleTest = name => {
