node gyp安装canvas原生模块编译node pregyp详解

npm install canvas

{
    ...,
    "scripts": {
        "prebenchmark": "node-gyp build",
        "benchmark": "node benchmarks/run.js",
        "lint": "standard examples/*.js test/server.js test/public/*.js benchmarks/run.js lib/context2d.js util/has_lib.js browser.js index.js",
        "test": "mocha test/*.test.js",
        "pretest-server": "node-gyp build",
        "test-server": "node test/server.js",
        "generate-wpt": "node ./test/wpt/generate.js",
        "test-wpt": "mocha test/wpt/generated/*.js",
        "install": "node-pre-gyp install --fallback-to-build --update-binary",
        "dtslint": "dtslint types"
    }
}

existsAsync(binary_module, (found) => {
      if (!update_binary) {
        if (found) {
          console.log('[' + package_json.name + '] Success: "' + binary_module + '" already installed');
          console.log('Pass --update-binary to reinstall or --build-from-source to recompile');
          return callback();
        }
        log.info('check', 'checked for "' + binary_module + '" (not found)');
      }
      makeDir(to).then(() => {
        const fileName = from.startsWith('file://') && from.slice('file://'.length);
        if (fileName) {
          extract_from_local(fileName, to, after_place);
        } else {
          place_binary(from, to, opts, after_place);
        }
      }).catch((err) => {
        after_place(err);
      });
      function after_place(err) {
        if (err && should_do_fallback_build) {
          print_fallback_error(err, opts, package_json);
          return do_build(gyp, argv, callback);
        } else if (err) {
          return callback(err);
        } else {
          console.log('[' + package_json.name + '] Success: "' + binary_module + '" is installed via remote');
          return callback();
        }
      }
    });

const host = process.env['npm_config_' + validModuleName + '_binary_host_mirror'] || package_json.binary.host;
opts.host = fix_slashes(eval_template(host, opts));
...
opts.remote_path = package_json.binary.remote_path ? drop_double_slashes(fix_slashes(eval_template(package_json.binary.remote_path, opts))) : default_remote_path;
...
opts.hosted_path = url.resolve(opts.host, opts.remote_path);
opts.hosted_tarball = url.resolve(opts.hosted_path, opts.package_name);

canvas_binary_host_mirror=https://registry.npmmirror.com/-/binary/canvas