diff --git a/enums.py b/enums.py
index be219cd7..ddc9c6b2 100644
--- a/enums.py
+++ b/enums.py
@@ -247,7 +247,7 @@ for name, values in sorted(ENUMS.items()):
         f.write("}\n")
 
 # write out javascript file
-with open(root + "/javascript/src_js/generated/YGEnums.js", "w") as f:
+with open(root + "/javascript/src/generated/YGEnums.js", "w") as f:
     f.write(get_license("js"))
     items = sorted(ENUMS.items())
     for name, values in items:
@@ -265,7 +265,7 @@ with open(root + "/javascript/src_js/generated/YGEnums.js", "w") as f:
         if name != items[-1][0]:
             f.write("\n")
 
-with open(root + "/javascript/src_js/generated/YGEnums.d.ts", "w") as f:
+with open(root + "/javascript/src/generated/YGEnums.d.ts", "w") as f:
     f.write(get_license("js"))
 
     for name, values in sorted(ENUMS.items()):
@@ -277,7 +277,7 @@ with open(root + "/javascript/src_js/generated/YGEnums.d.ts", "w") as f:
             f.write(
                 (
                     "type {name}_{value} = {ordinal} & ['{name}']\n"
-                    + "export const {name}_{value}: {name}_{value};\n\n"
+                    + "export declare const {name}_{value}: {name}_{value};\n\n"
                 ).format(
                     name=to_java_upper(name),
                     value=to_java_upper(value_arg),
diff --git a/javascript/.prettierignore b/javascript/.prettierignore
index 81f49fc9..8b9a7043 100644
--- a/javascript/.prettierignore
+++ b/javascript/.prettierignore
@@ -1,2 +1,2 @@
 tests/generated/
-src_js/generated/
+src/generated/
diff --git a/javascript/CMakeLists.txt b/javascript/CMakeLists.txt
index 1306dace..01177fcc 100644
--- a/javascript/CMakeLists.txt
+++ b/javascript/CMakeLists.txt
@@ -10,7 +10,7 @@ project(yoga)
 file(GLOB SOURCES CONFIGURE_DEPENDS
     ${CMAKE_CURRENT_SOURCE_DIR}/../yoga/*.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/../yoga/**/*.cpp
-    ${CMAKE_CURRENT_SOURCE_DIR}/src_native/*.cc)
+    ${CMAKE_CURRENT_SOURCE_DIR}/src/*.cpp)
 
 include_directories(..)
 
diff --git a/javascript/just.config.ts b/javascript/just.config.ts
index 3b4175ac..dcc7776e 100644
--- a/javascript/just.config.ts
+++ b/javascript/just.config.ts
@@ -10,7 +10,6 @@
 import {
   argv,
   cleanTask,
-  copyTask,
   eslintTask,
   logger,
   jestTask,
@@ -32,15 +31,6 @@ option('fix');
 
 task('clean', cleanTask({paths: ['build', 'dist']}));
 
-task(
-  'prepare-for-build',
-  parallel(
-    babelTransformTask({paths: ['src_js'], dest: 'dist'}),
-    copyTask({paths: ['src_js/**/*.d.ts'], dest: 'dist'}),
-    emcmakeGenerateTask(),
-  ),
-);
-
 function defineFlavor(flavor: string, env: NodeJS.ProcessEnv) {
   task(`cmake-build:${flavor}`, cmakeBuildTask({targets: [flavor]}));
   task(
@@ -49,7 +39,7 @@ function defineFlavor(flavor: string, env: NodeJS.ProcessEnv) {
   );
   task(
     `test:${flavor}`,
-    series('prepare-for-build', `cmake-build:${flavor}`, `jest:${flavor}`),
+    series(emcmakeGenerateTask(), `cmake-build:${flavor}`, `jest:${flavor}`),
   );
 }
 
@@ -68,12 +58,12 @@ task(
   cmakeBuildTask({targets: ['asmjs-sync', 'wasm-sync']}),
 );
 
-task('build', series('prepare-for-build', 'cmake-build:all'));
+task('build', series(emcmakeGenerateTask(), 'cmake-build:all'));
 
 task(
   'test',
   series(
-    'prepare-for-build',
+    emcmakeGenerateTask(),
     series('cmake-build:asmjs-async', 'jest:asmjs-async'),
     series('cmake-build:asmjs-sync', 'jest:asmjs-sync'),
     series('cmake-build:wasm-async', 'jest:wasm-async'),
@@ -83,26 +73,41 @@ task(
 
 task(
   'benchmark',
-  series('prepare-for-build', 'cmake-build:sync', runBenchTask()),
+  series(emcmakeGenerateTask(), 'cmake-build:sync', runBenchTask()),
 );
 
 task(
   'lint',
   parallel(
-    tscTask(),
+    tscTask({noEmit: true}),
     series(eslintTask({fix: argv().fix}), clangFormatTask({fix: argv().fix})),
   ),
 );
 
-function babelTransformTask(opts: {
-  paths: ReadonlyArray<string>;
-  dest: string;
-}) {
-  return () => {
-    const args = [...opts.paths, '--source-maps', '--out-dir', opts.dest];
-    logger.info(`Transforming [${opts.paths.join(',')}] to '${opts.dest}'`);
+task(
+  'prepublish',
+  parallel(
+    'build',
+    tscTask({emitDeclarationOnly: true}),
+    babelTransformTask({dir: 'src'}),
+  ),
+);
 
-    return spawn(node, [require.resolve('@babel/cli/bin/babel'), ...args]);
+function babelTransformTask(opts: {dir: string}) {
+  return () => {
+    const args = [
+      opts.dir,
+      '--source-maps',
+      '--out-dir',
+      opts.dir,
+      '--extensions',
+      '.js,.ts',
+    ];
+    logger.info(`Transforming "${path.resolve(opts.dir)}"`);
+
+    return spawn(node, [require.resolve('@babel/cli/bin/babel'), ...args], {
+      cwd: __dirname,
+    });
   };
 }
 
diff --git a/javascript/package.json b/javascript/package.json
index 7aa94eec..683ec3b3 100644
--- a/javascript/package.json
+++ b/javascript/package.json
@@ -7,23 +7,23 @@
     "type": "git",
     "url": "git@github.com:facebook/yoga.git"
   },
-  "main": "./dist/index.js",
-  "types": "./dist/index.d.ts",
+  "main": "./src/index.js",
+  "types": "./src/index.d.ts",
   "exports": {
     ".": {
-      "browser": "./dist/entrypoint/wasm-async.js",
-      "node": "./dist/entrypoint/wasm-async.js",
-      "default": "./dist/entrypoint/asmjs-async.js"
+      "browser": "./src/entrypoint/wasm-async.js",
+      "node": "./src/entrypoint/wasm-async.js",
+      "default": "./src/entrypoint/asmjs-async.js"
     },
     "./sync": {
-      "browser": "./dist/entrypoint/asmjs-sync.js",
-      "node": "./dist/entrypoint/wasm-sync.js",
-      "default": "./dist/entrypoint/asmjs-sync.js"
+      "browser": "./src/entrypoint/asmjs-sync.js",
+      "node": "./src/entrypoint/wasm-sync.js",
+      "default": "./src/entrypoint/asmjs-sync.js"
     }
   },
   "files": [
     "dist/**",
-    "src_js/**"
+    "src/**"
   ],
   "scripts": {
     "benchmark": "just benchmark",
@@ -31,6 +31,7 @@
     "clean": "just clean",
     "lint": "just lint",
     "lint:fix": "just lint --fix",
+    "prepublish": "just prepublish",
     "test": "just test",
     "test:asmjs-async": "just test:asmjs-async",
     "test:asmjs-sync": "just test:asmjs-sync",
diff --git a/javascript/src_native/Config.cc b/javascript/src/Config.cpp
similarity index 98%
rename from javascript/src_native/Config.cc
rename to javascript/src/Config.cpp
index edd5294b..986e553e 100644
--- a/javascript/src_native/Config.cc
+++ b/javascript/src/Config.cpp
@@ -7,7 +7,7 @@
 
 #include <yoga/Yoga.h>
 
-#include "./Config.hh"
+#include "./Config.h"
 
 /* static */ Config* Config::create(void) {
   return new Config();
diff --git a/javascript/src_native/Config.hh b/javascript/src/Config.h
similarity index 100%
rename from javascript/src_native/Config.hh
rename to javascript/src/Config.h
diff --git a/javascript/src_native/Layout.hh b/javascript/src/Layout.h
similarity index 100%
rename from javascript/src_native/Layout.hh
rename to javascript/src/Layout.h
diff --git a/javascript/src_native/Node.cc b/javascript/src/Node.cpp
similarity index 99%
rename from javascript/src_native/Node.cc
rename to javascript/src/Node.cpp
index daadf753..2a1afa98 100644
--- a/javascript/src_native/Node.cc
+++ b/javascript/src/Node.cpp
@@ -9,10 +9,10 @@
 
 #include <yoga/Yoga.h>
 
-#include "./Node.hh"
-#include "./Layout.hh"
-#include "./Size.hh"
-#include "./Config.hh"
+#include "./Node.h"
+#include "./Layout.h"
+#include "./Size.h"
+#include "./Config.h"
 
 static YGSize globalMeasureFunc(
     YGNodeRef nodeRef,
diff --git a/javascript/src_native/Node.hh b/javascript/src/Node.h
similarity index 98%
rename from javascript/src_native/Node.hh
rename to javascript/src/Node.h
index d416f8e0..7adb5424 100644
--- a/javascript/src_native/Node.hh
+++ b/javascript/src/Node.h
@@ -12,10 +12,10 @@
 #include <emscripten/bind.h>
 #include <yoga/Yoga.h>
 
-#include "./Layout.hh"
-#include "./Size.hh"
-#include "./Value.hh"
-#include "./Config.hh"
+#include "./Layout.h"
+#include "./Size.h"
+#include "./Value.h"
+#include "./Config.h"
 
 class MeasureCallback {
 public:
diff --git a/javascript/src_native/Size.hh b/javascript/src/Size.h
similarity index 100%
rename from javascript/src_native/Size.hh
rename to javascript/src/Size.h
diff --git a/javascript/src_native/Value.hh b/javascript/src/Value.h
similarity index 100%
rename from javascript/src_native/Value.hh
rename to javascript/src/Value.h
diff --git a/javascript/src_native/embind.cc b/javascript/src/embind.cpp
similarity index 98%
rename from javascript/src_native/embind.cc
rename to javascript/src/embind.cpp
index 280d9328..d30094e9 100644
--- a/javascript/src_native/embind.cc
+++ b/javascript/src/embind.cpp
@@ -5,11 +5,11 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-#include "./Node.hh"
-#include "./Layout.hh"
-#include "./Size.hh"
-#include "./Value.hh"
-#include "./Config.hh"
+#include "./Node.h"
+#include "./Layout.h"
+#include "./Size.h"
+#include "./Value.h"
+#include "./Config.h"
 
 #include <yoga/Yoga.h>
 #include <emscripten/bind.h>
diff --git a/javascript/src_js/entrypoint/_entryAsync.js b/javascript/src/entrypoint/_entryAsync.js
similarity index 100%
rename from javascript/src_js/entrypoint/_entryAsync.js
rename to javascript/src/entrypoint/_entryAsync.js
diff --git a/javascript/src_js/entrypoint/_entrySync.js b/javascript/src/entrypoint/_entrySync.js
similarity index 100%
rename from javascript/src_js/entrypoint/_entrySync.js
rename to javascript/src/entrypoint/_entrySync.js
diff --git a/javascript/src_js/entrypoint/asmjs-async.js b/javascript/src/entrypoint/asmjs-async.js
similarity index 100%
rename from javascript/src_js/entrypoint/asmjs-async.js
rename to javascript/src/entrypoint/asmjs-async.js
diff --git a/javascript/src_js/entrypoint/asmjs-sync.js b/javascript/src/entrypoint/asmjs-sync.js
similarity index 100%
rename from javascript/src_js/entrypoint/asmjs-sync.js
rename to javascript/src/entrypoint/asmjs-sync.js
diff --git a/javascript/src_js/entrypoint/wasm-async.js b/javascript/src/entrypoint/wasm-async.js
similarity index 100%
rename from javascript/src_js/entrypoint/wasm-async.js
rename to javascript/src/entrypoint/wasm-async.js
diff --git a/javascript/src_js/entrypoint/wasm-sync.js b/javascript/src/entrypoint/wasm-sync.js
similarity index 100%
rename from javascript/src_js/entrypoint/wasm-sync.js
rename to javascript/src/entrypoint/wasm-sync.js
diff --git a/javascript/src_js/generated/YGEnums.d.ts b/javascript/src/generated/YGEnums.d.ts
similarity index 58%
rename from javascript/src_js/generated/YGEnums.d.ts
rename to javascript/src/generated/YGEnums.d.ts
index cd31ee7d..0881bd2f 100644
--- a/javascript/src_js/generated/YGEnums.d.ts
+++ b/javascript/src/generated/YGEnums.d.ts
@@ -8,234 +8,234 @@
 // @generated by enums.py
 
 type ALIGN_AUTO = 0 & ['ALIGN']
-export const ALIGN_AUTO: ALIGN_AUTO;
+export declare const ALIGN_AUTO: ALIGN_AUTO;
 
 type ALIGN_FLEX_START = 1 & ['ALIGN']
-export const ALIGN_FLEX_START: ALIGN_FLEX_START;
+export declare const ALIGN_FLEX_START: ALIGN_FLEX_START;
 
 type ALIGN_CENTER = 2 & ['ALIGN']
-export const ALIGN_CENTER: ALIGN_CENTER;
+export declare const ALIGN_CENTER: ALIGN_CENTER;
 
 type ALIGN_FLEX_END = 3 & ['ALIGN']
-export const ALIGN_FLEX_END: ALIGN_FLEX_END;
+export declare const ALIGN_FLEX_END: ALIGN_FLEX_END;
 
 type ALIGN_STRETCH = 4 & ['ALIGN']
-export const ALIGN_STRETCH: ALIGN_STRETCH;
+export declare const ALIGN_STRETCH: ALIGN_STRETCH;
 
 type ALIGN_BASELINE = 5 & ['ALIGN']
-export const ALIGN_BASELINE: ALIGN_BASELINE;
+export declare const ALIGN_BASELINE: ALIGN_BASELINE;
 
 type ALIGN_SPACE_BETWEEN = 6 & ['ALIGN']
-export const ALIGN_SPACE_BETWEEN: ALIGN_SPACE_BETWEEN;
+export declare const ALIGN_SPACE_BETWEEN: ALIGN_SPACE_BETWEEN;
 
 type ALIGN_SPACE_AROUND = 7 & ['ALIGN']
-export const ALIGN_SPACE_AROUND: ALIGN_SPACE_AROUND;
+export declare const ALIGN_SPACE_AROUND: ALIGN_SPACE_AROUND;
 
 
 type DIMENSION_WIDTH = 0 & ['DIMENSION']
-export const DIMENSION_WIDTH: DIMENSION_WIDTH;
+export declare const DIMENSION_WIDTH: DIMENSION_WIDTH;
 
 type DIMENSION_HEIGHT = 1 & ['DIMENSION']
-export const DIMENSION_HEIGHT: DIMENSION_HEIGHT;
+export declare const DIMENSION_HEIGHT: DIMENSION_HEIGHT;
 
 
 type DIRECTION_INHERIT = 0 & ['DIRECTION']
-export const DIRECTION_INHERIT: DIRECTION_INHERIT;
+export declare const DIRECTION_INHERIT: DIRECTION_INHERIT;
 
 type DIRECTION_LTR = 1 & ['DIRECTION']
-export const DIRECTION_LTR: DIRECTION_LTR;
+export declare const DIRECTION_LTR: DIRECTION_LTR;
 
 type DIRECTION_RTL = 2 & ['DIRECTION']
-export const DIRECTION_RTL: DIRECTION_RTL;
+export declare const DIRECTION_RTL: DIRECTION_RTL;
 
 
 type DISPLAY_FLEX = 0 & ['DISPLAY']
-export const DISPLAY_FLEX: DISPLAY_FLEX;
+export declare const DISPLAY_FLEX: DISPLAY_FLEX;
 
 type DISPLAY_NONE = 1 & ['DISPLAY']
-export const DISPLAY_NONE: DISPLAY_NONE;
+export declare const DISPLAY_NONE: DISPLAY_NONE;
 
 
 type EDGE_LEFT = 0 & ['EDGE']
-export const EDGE_LEFT: EDGE_LEFT;
+export declare const EDGE_LEFT: EDGE_LEFT;
 
 type EDGE_TOP = 1 & ['EDGE']
-export const EDGE_TOP: EDGE_TOP;
+export declare const EDGE_TOP: EDGE_TOP;
 
 type EDGE_RIGHT = 2 & ['EDGE']
-export const EDGE_RIGHT: EDGE_RIGHT;
+export declare const EDGE_RIGHT: EDGE_RIGHT;
 
 type EDGE_BOTTOM = 3 & ['EDGE']
-export const EDGE_BOTTOM: EDGE_BOTTOM;
+export declare const EDGE_BOTTOM: EDGE_BOTTOM;
 
 type EDGE_START = 4 & ['EDGE']
-export const EDGE_START: EDGE_START;
+export declare const EDGE_START: EDGE_START;
 
 type EDGE_END = 5 & ['EDGE']
-export const EDGE_END: EDGE_END;
+export declare const EDGE_END: EDGE_END;
 
 type EDGE_HORIZONTAL = 6 & ['EDGE']
-export const EDGE_HORIZONTAL: EDGE_HORIZONTAL;
+export declare const EDGE_HORIZONTAL: EDGE_HORIZONTAL;
 
 type EDGE_VERTICAL = 7 & ['EDGE']
-export const EDGE_VERTICAL: EDGE_VERTICAL;
+export declare const EDGE_VERTICAL: EDGE_VERTICAL;
 
 type EDGE_ALL = 8 & ['EDGE']
-export const EDGE_ALL: EDGE_ALL;
+export declare const EDGE_ALL: EDGE_ALL;
 
 
 type ERRATA_NONE = 0 & ['ERRATA']
-export const ERRATA_NONE: ERRATA_NONE;
+export declare const ERRATA_NONE: ERRATA_NONE;
 
 type ERRATA_STRETCH_FLEX_BASIS = 1 & ['ERRATA']
-export const ERRATA_STRETCH_FLEX_BASIS: ERRATA_STRETCH_FLEX_BASIS;
+export declare const ERRATA_STRETCH_FLEX_BASIS: ERRATA_STRETCH_FLEX_BASIS;
 
 type ERRATA_ALL = 2147483647 & ['ERRATA']
-export const ERRATA_ALL: ERRATA_ALL;
+export declare const ERRATA_ALL: ERRATA_ALL;
 
 type ERRATA_CLASSIC = 2147483646 & ['ERRATA']
-export const ERRATA_CLASSIC: ERRATA_CLASSIC;
+export declare const ERRATA_CLASSIC: ERRATA_CLASSIC;
 
 
 type EXPERIMENTAL_FEATURE_WEB_FLEX_BASIS = 0 & ['EXPERIMENTAL_FEATURE']
-export const EXPERIMENTAL_FEATURE_WEB_FLEX_BASIS: EXPERIMENTAL_FEATURE_WEB_FLEX_BASIS;
+export declare const EXPERIMENTAL_FEATURE_WEB_FLEX_BASIS: EXPERIMENTAL_FEATURE_WEB_FLEX_BASIS;
 
 type EXPERIMENTAL_FEATURE_ABSOLUTE_PERCENTAGE_AGAINST_PADDING_EDGE = 1 & ['EXPERIMENTAL_FEATURE']
-export const EXPERIMENTAL_FEATURE_ABSOLUTE_PERCENTAGE_AGAINST_PADDING_EDGE: EXPERIMENTAL_FEATURE_ABSOLUTE_PERCENTAGE_AGAINST_PADDING_EDGE;
+export declare const EXPERIMENTAL_FEATURE_ABSOLUTE_PERCENTAGE_AGAINST_PADDING_EDGE: EXPERIMENTAL_FEATURE_ABSOLUTE_PERCENTAGE_AGAINST_PADDING_EDGE;
 
 type EXPERIMENTAL_FEATURE_FIX_ABSOLUTE_TRAILING_COLUMN_MARGIN = 2 & ['EXPERIMENTAL_FEATURE']
-export const EXPERIMENTAL_FEATURE_FIX_ABSOLUTE_TRAILING_COLUMN_MARGIN: EXPERIMENTAL_FEATURE_FIX_ABSOLUTE_TRAILING_COLUMN_MARGIN;
+export declare const EXPERIMENTAL_FEATURE_FIX_ABSOLUTE_TRAILING_COLUMN_MARGIN: EXPERIMENTAL_FEATURE_FIX_ABSOLUTE_TRAILING_COLUMN_MARGIN;
 
 
 type FLEX_DIRECTION_COLUMN = 0 & ['FLEX_DIRECTION']
-export const FLEX_DIRECTION_COLUMN: FLEX_DIRECTION_COLUMN;
+export declare const FLEX_DIRECTION_COLUMN: FLEX_DIRECTION_COLUMN;
 
 type FLEX_DIRECTION_COLUMN_REVERSE = 1 & ['FLEX_DIRECTION']
-export const FLEX_DIRECTION_COLUMN_REVERSE: FLEX_DIRECTION_COLUMN_REVERSE;
+export declare const FLEX_DIRECTION_COLUMN_REVERSE: FLEX_DIRECTION_COLUMN_REVERSE;
 
 type FLEX_DIRECTION_ROW = 2 & ['FLEX_DIRECTION']
-export const FLEX_DIRECTION_ROW: FLEX_DIRECTION_ROW;
+export declare const FLEX_DIRECTION_ROW: FLEX_DIRECTION_ROW;
 
 type FLEX_DIRECTION_ROW_REVERSE = 3 & ['FLEX_DIRECTION']
-export const FLEX_DIRECTION_ROW_REVERSE: FLEX_DIRECTION_ROW_REVERSE;
+export declare const FLEX_DIRECTION_ROW_REVERSE: FLEX_DIRECTION_ROW_REVERSE;
 
 
 type GUTTER_COLUMN = 0 & ['GUTTER']
-export const GUTTER_COLUMN: GUTTER_COLUMN;
+export declare const GUTTER_COLUMN: GUTTER_COLUMN;
 
 type GUTTER_ROW = 1 & ['GUTTER']
-export const GUTTER_ROW: GUTTER_ROW;
+export declare const GUTTER_ROW: GUTTER_ROW;
 
 type GUTTER_ALL = 2 & ['GUTTER']
-export const GUTTER_ALL: GUTTER_ALL;
+export declare const GUTTER_ALL: GUTTER_ALL;
 
 
 type JUSTIFY_FLEX_START = 0 & ['JUSTIFY']
-export const JUSTIFY_FLEX_START: JUSTIFY_FLEX_START;
+export declare const JUSTIFY_FLEX_START: JUSTIFY_FLEX_START;
 
 type JUSTIFY_CENTER = 1 & ['JUSTIFY']
-export const JUSTIFY_CENTER: JUSTIFY_CENTER;
+export declare const JUSTIFY_CENTER: JUSTIFY_CENTER;
 
 type JUSTIFY_FLEX_END = 2 & ['JUSTIFY']
-export const JUSTIFY_FLEX_END: JUSTIFY_FLEX_END;
+export declare const JUSTIFY_FLEX_END: JUSTIFY_FLEX_END;
 
 type JUSTIFY_SPACE_BETWEEN = 3 & ['JUSTIFY']
-export const JUSTIFY_SPACE_BETWEEN: JUSTIFY_SPACE_BETWEEN;
+export declare const JUSTIFY_SPACE_BETWEEN: JUSTIFY_SPACE_BETWEEN;
 
 type JUSTIFY_SPACE_AROUND = 4 & ['JUSTIFY']
-export const JUSTIFY_SPACE_AROUND: JUSTIFY_SPACE_AROUND;
+export declare const JUSTIFY_SPACE_AROUND: JUSTIFY_SPACE_AROUND;
 
 type JUSTIFY_SPACE_EVENLY = 5 & ['JUSTIFY']
-export const JUSTIFY_SPACE_EVENLY: JUSTIFY_SPACE_EVENLY;
+export declare const JUSTIFY_SPACE_EVENLY: JUSTIFY_SPACE_EVENLY;
 
 
 type LOG_LEVEL_ERROR = 0 & ['LOG_LEVEL']
-export const LOG_LEVEL_ERROR: LOG_LEVEL_ERROR;
+export declare const LOG_LEVEL_ERROR: LOG_LEVEL_ERROR;
 
 type LOG_LEVEL_WARN = 1 & ['LOG_LEVEL']
-export const LOG_LEVEL_WARN: LOG_LEVEL_WARN;
+export declare const LOG_LEVEL_WARN: LOG_LEVEL_WARN;
 
 type LOG_LEVEL_INFO = 2 & ['LOG_LEVEL']
-export const LOG_LEVEL_INFO: LOG_LEVEL_INFO;
+export declare const LOG_LEVEL_INFO: LOG_LEVEL_INFO;
 
 type LOG_LEVEL_DEBUG = 3 & ['LOG_LEVEL']
-export const LOG_LEVEL_DEBUG: LOG_LEVEL_DEBUG;
+export declare const LOG_LEVEL_DEBUG: LOG_LEVEL_DEBUG;
 
 type LOG_LEVEL_VERBOSE = 4 & ['LOG_LEVEL']
-export const LOG_LEVEL_VERBOSE: LOG_LEVEL_VERBOSE;
+export declare const LOG_LEVEL_VERBOSE: LOG_LEVEL_VERBOSE;
 
 type LOG_LEVEL_FATAL = 5 & ['LOG_LEVEL']
-export const LOG_LEVEL_FATAL: LOG_LEVEL_FATAL;
+export declare const LOG_LEVEL_FATAL: LOG_LEVEL_FATAL;
 
 
 type MEASURE_MODE_UNDEFINED = 0 & ['MEASURE_MODE']
-export const MEASURE_MODE_UNDEFINED: MEASURE_MODE_UNDEFINED;
+export declare const MEASURE_MODE_UNDEFINED: MEASURE_MODE_UNDEFINED;
 
 type MEASURE_MODE_EXACTLY = 1 & ['MEASURE_MODE']
-export const MEASURE_MODE_EXACTLY: MEASURE_MODE_EXACTLY;
+export declare const MEASURE_MODE_EXACTLY: MEASURE_MODE_EXACTLY;
 
 type MEASURE_MODE_AT_MOST = 2 & ['MEASURE_MODE']
-export const MEASURE_MODE_AT_MOST: MEASURE_MODE_AT_MOST;
+export declare const MEASURE_MODE_AT_MOST: MEASURE_MODE_AT_MOST;
 
 
 type NODE_TYPE_DEFAULT = 0 & ['NODE_TYPE']
-export const NODE_TYPE_DEFAULT: NODE_TYPE_DEFAULT;
+export declare const NODE_TYPE_DEFAULT: NODE_TYPE_DEFAULT;
 
 type NODE_TYPE_TEXT = 1 & ['NODE_TYPE']
-export const NODE_TYPE_TEXT: NODE_TYPE_TEXT;
+export declare const NODE_TYPE_TEXT: NODE_TYPE_TEXT;
 
 
 type OVERFLOW_VISIBLE = 0 & ['OVERFLOW']
-export const OVERFLOW_VISIBLE: OVERFLOW_VISIBLE;
+export declare const OVERFLOW_VISIBLE: OVERFLOW_VISIBLE;
 
 type OVERFLOW_HIDDEN = 1 & ['OVERFLOW']
-export const OVERFLOW_HIDDEN: OVERFLOW_HIDDEN;
+export declare const OVERFLOW_HIDDEN: OVERFLOW_HIDDEN;
 
 type OVERFLOW_SCROLL = 2 & ['OVERFLOW']
-export const OVERFLOW_SCROLL: OVERFLOW_SCROLL;
+export declare const OVERFLOW_SCROLL: OVERFLOW_SCROLL;
 
 
 type POSITION_TYPE_STATIC = 0 & ['POSITION_TYPE']
-export const POSITION_TYPE_STATIC: POSITION_TYPE_STATIC;
+export declare const POSITION_TYPE_STATIC: POSITION_TYPE_STATIC;
 
 type POSITION_TYPE_RELATIVE = 1 & ['POSITION_TYPE']
-export const POSITION_TYPE_RELATIVE: POSITION_TYPE_RELATIVE;
+export declare const POSITION_TYPE_RELATIVE: POSITION_TYPE_RELATIVE;
 
 type POSITION_TYPE_ABSOLUTE = 2 & ['POSITION_TYPE']
-export const POSITION_TYPE_ABSOLUTE: POSITION_TYPE_ABSOLUTE;
+export declare const POSITION_TYPE_ABSOLUTE: POSITION_TYPE_ABSOLUTE;
 
 
 type PRINT_OPTIONS_LAYOUT = 1 & ['PRINT_OPTIONS']
-export const PRINT_OPTIONS_LAYOUT: PRINT_OPTIONS_LAYOUT;
+export declare const PRINT_OPTIONS_LAYOUT: PRINT_OPTIONS_LAYOUT;
 
 type PRINT_OPTIONS_STYLE = 2 & ['PRINT_OPTIONS']
-export const PRINT_OPTIONS_STYLE: PRINT_OPTIONS_STYLE;
+export declare const PRINT_OPTIONS_STYLE: PRINT_OPTIONS_STYLE;
 
 type PRINT_OPTIONS_CHILDREN = 4 & ['PRINT_OPTIONS']
-export const PRINT_OPTIONS_CHILDREN: PRINT_OPTIONS_CHILDREN;
+export declare const PRINT_OPTIONS_CHILDREN: PRINT_OPTIONS_CHILDREN;
 
 
 type UNIT_UNDEFINED = 0 & ['UNIT']
-export const UNIT_UNDEFINED: UNIT_UNDEFINED;
+export declare const UNIT_UNDEFINED: UNIT_UNDEFINED;
 
 type UNIT_POINT = 1 & ['UNIT']
-export const UNIT_POINT: UNIT_POINT;
+export declare const UNIT_POINT: UNIT_POINT;
 
 type UNIT_PERCENT = 2 & ['UNIT']
-export const UNIT_PERCENT: UNIT_PERCENT;
+export declare const UNIT_PERCENT: UNIT_PERCENT;
 
 type UNIT_AUTO = 3 & ['UNIT']
-export const UNIT_AUTO: UNIT_AUTO;
+export declare const UNIT_AUTO: UNIT_AUTO;
 
 
 type WRAP_NO_WRAP = 0 & ['WRAP']
-export const WRAP_NO_WRAP: WRAP_NO_WRAP;
+export declare const WRAP_NO_WRAP: WRAP_NO_WRAP;
 
 type WRAP_WRAP = 1 & ['WRAP']
-export const WRAP_WRAP: WRAP_WRAP;
+export declare const WRAP_WRAP: WRAP_WRAP;
 
 type WRAP_WRAP_REVERSE = 2 & ['WRAP']
-export const WRAP_WRAP_REVERSE: WRAP_WRAP_REVERSE;
+export declare const WRAP_WRAP_REVERSE: WRAP_WRAP_REVERSE;
 
 
 export type Align =
diff --git a/javascript/src_js/generated/YGEnums.js b/javascript/src/generated/YGEnums.js
similarity index 100%
rename from javascript/src_js/generated/YGEnums.js
rename to javascript/src/generated/YGEnums.js
diff --git a/javascript/src_js/index.d.ts b/javascript/src/index.d.ts
similarity index 100%
rename from javascript/src_js/index.d.ts
rename to javascript/src/index.d.ts
diff --git a/javascript/src_js/index.js b/javascript/src/index.js
similarity index 100%
rename from javascript/src_js/index.js
rename to javascript/src/index.js
diff --git a/javascript/src_js/sync.d.ts b/javascript/src/sync.d.ts
similarity index 100%
rename from javascript/src_js/sync.d.ts
rename to javascript/src/sync.d.ts
diff --git a/javascript/src_js/sync.js b/javascript/src/sync.js
similarity index 100%
rename from javascript/src_js/sync.js
rename to javascript/src/sync.js
diff --git a/javascript/src_js/wrapAsm.d.ts b/javascript/src/wrapAsm.d.ts
similarity index 100%
rename from javascript/src_js/wrapAsm.d.ts
rename to javascript/src/wrapAsm.d.ts
diff --git a/javascript/src_js/wrapAsm.js b/javascript/src/wrapAsm.js
similarity index 100%
rename from javascript/src_js/wrapAsm.js
rename to javascript/src/wrapAsm.js
diff --git a/javascript/tsconfig.json b/javascript/tsconfig.json
index 5bce5bdc..2568d1e1 100644
--- a/javascript/tsconfig.json
+++ b/javascript/tsconfig.json
@@ -3,13 +3,13 @@
     "target": "es2018",
     "module": "commonjs",
     "strict": true,
+    "declaration": true,
     "esModuleInterop": true,
     "skipLibCheck": true,
     "forceConsistentCasingInFileNames": true,
-    "noEmit": true,
     "baseUrl": ".",
     "paths": {
-      "yoga-layout": ["src_js"]
+      "yoga-layout": ["src"]
     }
   },
   "ts-node": {