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The browser targets provided by `browserslist` have several differences than what `esbuild` expects for the Safari browsers. The first is that the iOS Safari is named `ios_saf` within browserslist and `ios` by esbuild. The former is now converted to the later when generating the target list for esbuild. The second difference is that `browserslist` supports a `TP` (Technology Preview) version for Safari but esbuild expects a numeric value for all versions. Since a TP version of Safari is assumed to be the latest unreleased version and as a result supports all currently known features, a high version number (999) is used as a replacement when generating the target list for esbuild.