Add early callback #13
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…allow a sequence of upgrades which can support promises returned by `addCallback` callbacks (and add docs and tests for multiple promise-based callbacks on different versions); Commenting: Indicate specific Safari bug within code; Refactoring: Use ES6 `Array.from`; add `Number.isInteger` and ES7 `Object.values()` in place of npm modules (requires babel-polyfill); Testing: Split off local testing from Sauce; prevent blocking; increase timeout for Firefox; add test to throw with previous version
…ted `addCallback` ones, can themselves use idb-schema methods (e.g., to convert from JSON to idb-schema) though, since they execute within `upgradeneeded` cannot support Promises (as can the callbacks within `addCallback` when `schema.open` or `schema.upgrade` are used); document
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Builds on top of the previous PR. Early callbacks will be run before the stores and indexes are added and deleted, allowing for such early callbacks to run idb-schema methods like
addStore. This is needed by theidb-importproject I am working on now, to allow specification of imports by JSON (without my needing to reinvent the wheel with your methods).It is also needed because the other PR allows normal callbacks to execute, as before, after the other methods, but in a way which supports promises--by having them run during the
successevent instead of duringupgradeneededwhenschema.openorschema.upgradeare used (it wouldn't make sense to use them inschema.callbacksince that is automatically going to be withinupgradeneeded); there should therefore also be a way to run a callback within theupgradeneededtransaction, e.g., to check the current object stores and conditionally add one if not present.