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[BUG][0.12.1] Unable to install on `mac10.13`

See original GitHub issue

Context:

Playwright Version: v0.12.1
Operating System: Mac
Extra: macOS High Sierra 10.13.6

Code Snippet npm install playwright-core playwright-chromium

~/project on  master [!?] 
$ npm install playwright-core playwright-chromium

> playwright-chromium@0.12.1 install /Users/admin/project/node_modules/playwright-chromium
> node install.js

(node:54634) UnhandledPromiseRejectionWarning: TypeError: path.join is not iterable (cannot read property Symbol(Symbol.iterator))
    at Object.executablePath (/Users/admin/project/node_modules/playwright-core/lib/server/browserFetcher.js:125:17)
    at downloadOptionsFromENV (/Users/admin/project/node_modules/playwright-core/download-browser.js:44:36)
    at /Users/admin/project/node_modules/playwright-chromium/install.js:21:40
    at Object.<anonymous> (/Users/admin/project/node_modules/playwright-chromium/install.js:22:3)
    at Module._compile (internal/modules/cjs/loader.js:1147:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1167:10)
    at Module.load (internal/modules/cjs/loader.js:996:32)
    at Function.Module._load (internal/modules/cjs/loader.js:896:14)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:71:12)
    at internal/main/run_main_module.js:17:47

Describe the bug

Can’t npm install playwright-chromium, throws at lib/server/browserFetcher.js:125:17<executablePath> due to mac10.13 not being mapped on the RELATIVE_EXECUTABLE_PATHS.