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Spin me a Yarn Serena Fritsch @serifritsch
[email protected]
Emberconf 2017
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Once upon a time…
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๏ First release in 2010
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๏ First release in 2010 ๏ NPM Registry
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๏ First release in 2010 ๏ NPM Registry ๏ 347184 published packages https://unpm.nodesource.com/
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๏ First release in 2010 ๏ NPM Registry ๏ 347184 published packages ๏ 11,164 packages per week https://unpm.nodesource.com/
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xkdc.com and reddit
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๏ Non-Determinism
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๏ Non-Determinism ๏ Performance
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๏ Uses npm registry
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๏ Uses npm registry ๏ Consistent and reliable dependency resolution
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๏ Uses npm registry ๏ Consistent and reliable dependency resolution ๏ Improved performance
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Dependency Resolution? Non-Determinism? Performance?
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In the beginning…
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Disclaimer ✓ You use a package manager ✓ You are familiar with the npm eco system
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What are packages?
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Piece of software that can be downloaded
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May depend on other packages
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What are dependencies? a^1.0.0 b^1.0.0 App
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Specified inside the package.json a^1.0.0 b^1.0.0 App
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a^1.0.0 b^1.0.0 App Follow semantic versioning
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https://xkcd.com/1172/
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Multiple levels of dependencies a^1.0.0 s^1.0.0 App b^1.0.0 s^2.0.0
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a^1.0.0 s^1.0.0 App b^1.0.0 s^2.0.0 No dependency conflicts
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Under the hood
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Project Code
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Project Code Manifest +
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Project Code Manifest + Dependency Code
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goo.gl/LJSNmP
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Disclaimer ✓ First-time installation ✓ Empty node_modules folder ✓ No pre-cached packages
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Install Phases 1. Dependency Resolution Make requests to the registry and look up dependencies recursively
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Install Phases 2. Fetching Packages Fetch package tarballs and place in global cache
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Install Phases 3. Linking Packages Copying files from global cache to local node_modules folder
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https://github.com/ashleygwilliams/npm-sandbox package.json
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https://github.com/ashleygwilliams/npm-sandbox package.json Dependency Graph a^1.0.0 b^1.0.0 App s^1.0.0 s^2.0.0
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. . node_modules folder a^1.0.0 b^1.0.0 App s^1.0.0 s^2.0.0
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. node_modules folder a1 b1 App s1 s2
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. . a1 s1 b1 s2 a1 b1 App s1 s2
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. Dependency Resolution 1. Load the existing node_modules tree from disc a1 b1 App s1 s2
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. Dependency Resolution 2. Clone the current tree a1 b1 App s1 s2
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. Dependency Resolution 3.Build the ideal tree a1 b1 App s1 s2
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. Dependency Resolution a1 b1 App s1 s2
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. Dependency Resolution a1 a1 b1 App s1 s2
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. Dependency Resolution a1 a1 b1 App s1 s2
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a1 s1 . Dependency Resolution a1 b1 App s1 s2
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a1 s1 . Dependency Resolution a1 b1 App s1 s2
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a1 s1 b1 . . Dependency Resolution a1 b1 App s1 s2
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a1 s1 b1 . Dependency Resolution a1 b1 App s1 s2
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. a1 s1 b1 s2 Dependency Resolution a1 b1 App s1 s2
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. Dependency Resolution 4.Generate Actions to take add
[email protected]
add
[email protected]
add
[email protected]
add
[email protected]
a1 s1 b1 s2 a1 b1 App s1 s2
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. Package Fetching and Linking a1 s1 b1 a1 s1 b1 s2
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. Dependency Resolution 1.Create a list of Package Requests a1 b1 App s1 s2
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. Dependency Resolution 2. Find Version on Registry a1 b1 App s1 s2
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. Dependency Resolution 3. Check existing dependencies a1 b1 App s1 s2
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. Dependency Resolution 4. Create a new Package Request and repeat… a1 b1 App s1 s2 a1
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. Dependency Resolution a1 b1 App s1 s2 a1
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a1 s1 . Dependency Resolution a1 b1 App s1 s2
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a1 s1 . Dependency Resolution a1 b1 App s1 s2
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a1 s1 b1 . . Dependency Resolution a1 b1 App s1 s2
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a1 s1 b1 . . Dependency Resolution a1 b1 App s1 s2
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a1 s1 b1 . Dependency Resolution a1 b1 App s1 s2 a1 s1 b1 s2
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. Package Fetching and Linking a1 s1 b1 a1 s1 b1 s2
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. . Save Lockfile a1 s1 b1 a1 s1 b1 s2
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“To make it more clear, your package.json states “what i want” for the project whereas your lock file says “what I had” in terms of dependencies” -Dan Abramov . . Save Lockfile
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.
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Differences
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a1 b1 App s1 s2 c1 s1 a1 b1 s2 s1 c1 https://docs.npmjs.com/how-npm-works/npm3-nondet
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Upgrade of Package A a2 b1 App s2 s2 c1 s1
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a1 b1 s2 s1 c1 a2 b1 App s2 s2 c1 s1
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a1 b1 s2 s1 c1 a2 b1 App s2 s2 c1 s1
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a2 b1 s2 s1 c1 a2 b1 App s2 s2 c1 s1
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a2 b1 s2 s1 c1 a2 b1 App s2 s2 c1 s1
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a2 b1 s2 s1 c1 a2 b1 App s2 s2 c1 s1 s2
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a2 b1 s2 s1 c1 a2 b1 App s2 s2 c1 s1 s2
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a2 b1 s2 s1 c1 a2 b1 App s2 s2 c1 s1 s2
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a2 b1 s2 s1 c1 a2 b1 App s2 s2 c1 s1 s2
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a2 b1 s2 s1 c1 a2 b1 App s2 s2 c1 s1 s2
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a2 b1 s2 s1 c1 a2 b1 App s2 s2 c1 s1 s2
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a2 b1 s2 s1 c1 a2 b1 App s2 s2 c1 s1 s2
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a2 b1 s2 s1 c1 a2 b1 App s2 s2 c1 s1 s2
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a2 b1 App s2 s2 c1 s1 a2 b1 s2 s1 c1 s2
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a2 b1 App s2 s2 c1 s1
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a2 b1 App s2 s2 c1 s1
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a2 b1 App s2 s2 c1 s1 a2
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a2 b1 App s2 s2 c1 s1 a2
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a2 s2 a2 b1 App s2 s2 c1 s1
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a2 s2 a2 b1 App s2 s2 c1 s1
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a2 b1 s2 a2 b1 App s2 s2 c1 s1
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a2 b1 s2 a2 b1 App s2 s2 c1 s1
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a2 b1 s2 a2 b1 App s2 s2 c1 s1
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a2 b1 s2 a2 b1 App s2 s2 c1 s1
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a2 b1 App s2 s2 c1 s1 a2 b1 s2 c1
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a2 b1 App s2 s2 c1 s1 a2 b1 s2 c1
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a2 b1 App s2 s2 c1 s1 a2 b1 s2 c1 s1
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a2 b1 s2 c1 s1 a2 b1 s2 s1 c1 s2
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Anything I can do? When in doubt, clear node_modules out
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Save Lockfile npm shrinkwrap
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Save Lockfile By default turned off
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Upgrade of Package A a2 b1 App s2 s2 c1 s1
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a2 b1 App s2 s2 c1 s1
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a2 b1 App s2 s2 c1 s1 a2
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a2 b1 App s2 s2 c1 s1 a2
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a2 s2 a2 b1 App s2 s2 c1 s1
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a2 s2 a2 b1 App s2 s2 c1 s1
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a2 b1 s2 a2 b1 App s2 s2 c1 s1
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a2 b1 s2 a2 b1 App s2 s2 c1 s1
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a2 b1 s2 a2 b1 App s2 s2 c1 s1
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a2 b1 s2 a2 b1 App s2 s2 c1 s1
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a2 b1 App s2 s2 c1 s1 a2 b1 s2 c1
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a2 b1 App s2 s2 c1 s1 a2 b1 s2 c1
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a2 b1 App s2 s2 c1 s1 a2 b1 s2 c1 s1
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a2 b1 s2 c1 s1
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a2 b1 s2 c1 s1
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Project Code package.json + + Lockfile
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Performance
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Issue opened by Sam Saccone November 2015 https://github.com/npm/npm/issues/10380
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GET a1 GET b1 GET s1 GET s1 Timeline start 1.0s 1.5s 2.0s 2.5s Multi-Stage Installation
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GET a1 GET b1 GET s1 GET s2 Timeline start 1.0s 1.5s 2.0s 2.5s a1 s1 b1 s2
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GET a1 GET b1 GET s1 GET s1 Timeline start 1.0s 1.5s 2.0s 2.5s a1 s1 b1 s2
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GET a1 GET b1 GET s1 GET s2 Timeline start 1.0s 1.5s 2.0s 2.5s a1 s1 b1 s2
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GET a1 GET b1 GET s1 GET s2 Timeline start 1.0s 1.5s 2.0s 2.5s a1 s1 b1 s2
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GET a1 GET b1 GET s1 GET s2 Timeline start 1.0s 1.5s 2.0s 2.5s a1 s1 b1 s2
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GET a1 GET b1 GET s1 GET s2 Timeline start 1.0s 1.5s 2.0s 2.5s a1 s1 b1 s2
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GET a1 GET b1 GET s1 GET s2 Timeline start 1.0s 1.5s 2.0s 2.5s a1 s1 b1 s2
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GET a1 GET b1 GET s1 GET s2 Timeline start 1.0s 1.5s 2.0s 2.5s a1 s1 b1 s2
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GET a1 GET b1 GET s1 GET s2 Timeline start 1.0s 1.5s 2.0s 2.5s a1 s1 b1 s2
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GET a1 GET b1 GET s1 GET s2 Timeline start 1.0s 1.5s 2.0s 2.5s a1 s1 b1 s2
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GET a1 GET b1 GET s2 Timeline start 1.0s 1.5s 2.0s 2.5s Built-In Parallelism GET s1
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GET a1 GET b1 GET s2 GET s1 Timeline start 1.0s 1.5s 2.0s 2.5s a1 s1 b1 s2
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GET a1 GET b1 GET s2 GET s1 Timeline start 1.0s 1.5s 2.0s 2.5s a1 s1 b1 s2
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GET a1 GET b1 GET s2 GET s1 Timeline start 1.0s 1.5s 2.0s 2.5s a1 s1 b1 s2
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GET a1 GET b1 GET s2 GET s1 Timeline start 1.0s 1.5s 2.0s 2.5s a1 s1 b1 s2
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GET a1 GET b1 GET s2 GET s1 Timeline start 1.0s 1.5s 2.0s 2.5s a1 s1 b1 s2
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GET a1 GET b1 GET s2 GET s1 Timeline start 1.0s 1.5s 2.0s 2.5s a1 s1 b1 s2
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Last Chapter
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Ember CLI 2.13 onwards is “yarn aware”
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Migrate your own projects typing yarn https://yarnpkg.com/lang/en/docs/migrating-from-npm/
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Community project with governance model taken from Ember and Rust Contribute https://github.com/yarnpkg/yarn
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Watch this Space as well http://blog.npmjs.org
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And they lived happily ever after…
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Thank You! @serifritsch
[email protected]