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Polymer v2.7.0 Release Notes

Release Date: 2018-12-03 // over 5 years ago

  • 🆕 New Features

    • ➕ Adds Polymer.legacyOptimizations flag
      • avoids copying element templates (this disables subclassing elements from defined with Polymer() calls)
      • turns on stripWhitespace for all templates.
      • Properties defined via behaviors or the call to Polymer() are copied at the first instance booting up.
    • ➕ Adds Polymer.strictTemplatePolicy flag
      • Strict Template Policy prevents a class of "template injection" attacks against element registration
      • All "self-stamping" templates including <dom-bind>, <dom-repeat>, and <dom-if> will throw errors and not stamp if not originating from inside the template of a trusted element registered via script
      • Re-registration of <dom-module> will throw and cause template lookup for that element name to return null
      • Elements that do not have templates by design must explicitly indicate a null template to prevent template retrieval from injected <dom-module>s, otherwise they will throw an error

    Meaningful Changes

    • Behaviors:
      • Now mixed in lazily rather than at class time. This change means behaviors are no longer in the element's prototype chain.
      • A memoized list of behavior lifecycle methods is constructed at finalization time and then used at runtime.
    • ✅ TemplateStamp: A TreeWalker is now used to crawl through template nodes. This should be slightly faster when the ShadyDOM polyfill is used.
    • Polymer.telemetry: now properly records registered elements, even if they have not been created

    Raw Notes

    ⚡️ Update to webcomponentsjs 1.3.0 (commit)

    👕 Lint fixes (commit)

    🛠 Fix settings to pull from Polymer object for defaults. (commit)

    ⚡️ Update types (commit)

    Merge css-build-dir changes into 2.x * Don't set up observer in ShadyDOM * Move __activateDir into check instead of replace * skip some tests that never really worked in ShadyDOM (commit)

    👉 Use closure-safe name (commit)

    ➕ Add tests (commit)

    Ensure properties and observers are interleaved per behavior (commit)

    Ensure property values are always overridden by extendors/behaviors (commit)

    Ensure registered is always called on element prototype (commit)

    Do lazy behavior copying only when legacyOptimizations is set (commit)

    🛠 Behavior property copying fixes (commit)

    Ensure initial static classes are preserved when a class$ binding is present. (commit)

    Avoid copying certain properties from behaviors (commit)

    🔀 Sync memoized properties getter with 3.x version. (commit)

    ✂ Remove unnecessary setting of _template. (commit)

    Minor renaming based on review. (commit)

    Slight tweaks based on review. (commit)

    Slightly improve how _registered is called. (commit)

    🔄 Changed based on review feedback. (commit)

    Ensure _template from behaviors takes precedence over is in legacy. (commit)

    ✅ TemplateStamp: fix TreeWalker (commit)

    ⚡️ update types (commit)

    ⚡️ update package-lock (commit)

    ⚡️ Update FF test config. (commit)

    Factor telemetry to separate module (commit)

    ⚡️ update more types (commit)

    ⚡️ update types (commit)

    ➕ Address linting issues. (commit)

    ➕ Address review feedback (commit)

    ⚡️ Update types. (commit)

    🔀 Sync with changes made in master. (commit)

    Disable running FF in headless mode on Travis (commit)

    🏁 Use windows for FF62 (commit)

    ⚡️ Update wct for FF63, add FF62 to sauce for pre-WC testing, drop Safari 10. (commit)

    Disable running FF in headless mode on Travis (commit)

    ➕ Add comment and handle undefined host case. (commit)

    🏁 Use windows for FF62 (commit)

    ⚡️ Update types. (commit)

    Behaviors (commit)

    ⚡️ Update wct for FF63, add FF62 to sauce for pre-WC testing, drop Safari 10. (commit)

    LegacyElement (commit)

    Apply mixin to TemplatizeInstance (commit)

    ⚡️ Update types. (commit)

    🔀 Sync with changes made on master. (commit)

    ➕ Adds legacyOptimizations flag (commit)

    📝 memoize behavior method lists for fasting runtime calling. (commit)

    stripWhitespace (commit)

    noDirMixin (commit)

    👯 noCloneTemplate (commit)

    lazyCopyProps (commit)

    🛠 Fix prototype registration (commit)

    🛠 Fix telemetry registrations to go eagerly (commit)

    👉 Use TreeWalker for template-stamp. (commit)

    Avoid using mixins for behaviors. (commit)

    ⚡️ [ci skip] update changelog (commit)

    🛠 Fix error reporting on Safari. (commit)

    ⚡️ Update types. (commit)

    ⚡️ Revert to legacy template getter, update tests. (commit)

    🛠 Fix lint warning. (commit)

    Ensure template helpers in trusted templates work. (commit)

    ⚡️ More updates based on code review. (commit)

    Ensure instanceof works after babel ES5 compilation (commit)

    ⚡️ Updates based on code review. (commit)

    🛠 Fix update-types. (commit)

    ⚡️ Update types. (commit)

    🛠 Fix lint warnings (commit)

    Catch errors on top window using on error Works around safari quirk when running in iframe (commit)

    ⚡️ Update types. (commit)

    🛠 Fix lint warning. (commit)

    🛠 Fix latent (benign) error thrown when removing dom-if via innerHTML. (commit)

    👉 Use setting set via global Polymer object. (commit)

    ➕ Add tests. (commit)

    Implement opt-in strictTemplatePolicy (flag TBD) - disable dom-bind - disable dom-module re-registration - require elements with no template to implement null template - disable templatizer of templates not stamped in trusted polymer template (commit)

    ➕ Add comment (commit)

    ✅ Factor out some helpers, add declarative tests. (commit)

    ➕ Add constructor name and fix mixin wrapping. (commit)

    🛠 Fix test name (commit)

    🛠 Fix method to force CE polyfill on (commit)

    ⚡️ Update types. (commit)

    Ensure class.html is imported before patching it. (commit)

    ➕ Add legacy-data-mixin tests to runner. (commit)

    ➕ Add legacy-data-mixin as 1.x->2.x migration aide. Fixes #5262. (commit)