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‎src/node_api.h‎
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‎test/parallel/test-process-versions.js‎
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‎test/parallel/test-process-versions.js‎
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‎tools/getnapibuildversion.py‎
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‎tools/getnapibuildversion.py‎
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@@ -34,6 +34,7 @@
 # imports in tools/
 sys.path.insert(0, 'tools')
 import getmoduleversion
+import getnapibuildversion
 from gyp_node import run_gyp
 
 # imports in deps/v8/tools/node
@@ -1131,6 +1132,10 @@ def configure_node(o):
   else:
     o['variables']['node_target_type'] = 'executable'
 
+def configure_napi(output):
+  version = getnapibuildversion.get_napi_version()
+  output['variables']['napi_build_version'] = version
+
 def configure_library(lib, output):
   shared_lib = 'shared_' + lib
   output['variables']['node_' + shared_lib] = b(getattr(options, shared_lib))
@@ -1603,6 +1608,7 @@ def make_bin_override():
 flavor = GetFlavor(flavor_params)
 
 configure_node(output)
+configure_napi(output)
 configure_library('zlib', output)
 configure_library('http_parser', output)
 configure_library('libuv', output)
 
@@ -661,6 +661,7 @@ An example of the possible output looks like:
   variables:
    {
      host_arch: 'x64',
+     napi_build_version: 4,
      node_install_npm: 'true',
      node_prefix: '',
      node_shared_cares: 'false',
 
@@ -9,7 +9,12 @@
 // Use INT_MAX, this should only be consumed by the pre-processor anyway.
 #define NAPI_VERSION 2147483647
 #else
-// The baseline version for N-API
+// The baseline version for N-API.
+// The NAPI_VERSION controls which version will be used by default when
+// compilling a native addon. If the addon developer specifically wants to use
+// functions available in a new version of N-API that is not yet ported in all
+// LTS versions, they can set NAPI_VERSION knowing that they have specifically
+// depended on that version.
 #define NAPI_VERSION 6
 #endif
 #endif
 
@@ -43,3 +43,6 @@ for (let i = 0; i < expected_keys.length; i++) {
   const descriptor = Object.getOwnPropertyDescriptor(process.versions, key);
   assert.strictEqual(descriptor.writable, false);
 }
+
+assert.strictEqual(process.config.variables.napi_build_version,
+                   process.versions.napi);
@@ -0,0 +1,26 @@
+from __future__ import print_function
+import os
+import re
+
+
+def get_napi_version():
+  napi_version_h = os.path.join(
+    os.path.dirname(__file__),
+    '..',
+    'src',
+    'node_version.h')
+
+  f = open(napi_version_h)
+
+  regex = '^#define NAPI_VERSION'
+
+  for line in f:
+    if re.match(regex, line):
+      napi_version = line.split()[2]
+      return napi_version
+
+  raise Exception('Could not find pattern matching %s' % regex)
+
+
+if __name__ == '__main__':
+  print(get_napi_version())
Original file line number	Diff line number	Diff line change
`@@ -661,6 +661,7 @@ An example of the possible output looks like:`
`661`	`661`	`variables:`
`662`	`662`	`{`
`663`	`663`	`host_arch: 'x64',`
	`664`	`+ napi_build_version: 4,`
`664`	`665`	`node_install_npm: 'true',`
`665`	`666`	`node_prefix: '',`
`666`	`667`	`node_shared_cares: 'false',`
Original file line number	Diff line number	Diff line change
`@@ -43,3 +43,6 @@ for (let i = 0; i < expected_keys.length; i++) {`
`43`	`43`	`const descriptor = Object.getOwnPropertyDescriptor(process.versions, key);`
`44`	`44`	`assert.strictEqual(descriptor.writable, false);`
`45`	`45`	`}`
	`46`	`+`
	`47`	`+assert.strictEqual(process.config.variables.napi_build_version,`
	`48`	`+ process.versions.napi);`