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由 Matt Bierner 提交于
From: https://github.com/Microsoft/TypeScript/issues/15352 TS 2.3.1 introduced a breaking change by [switching to covariant types for callbacks](https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#covariance-in-callback-parameters). This change tries to fix these compiler errors in the workbench codebase
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